The best ideas from RepliGo Reader 4.2.8 for Sumatra PDF. What I would like to see.

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Bottom Thumbnail Preview Panel with Adjustable Size

At the bottom of the screen I would like to see a panel with page thumbnail previews that can be resized according to the user's preference. The thumbnails should be large enough to recognize the content of each page at a glance, but small enough not to distract from the main reading area. The user should be able to drag the panel border up or down to change the thumbnail size dynamically, or set a fixed size in the settings. This panel would serve as the primary navigation hub for large documents, giving a visual map of the entire book.

Corner Hover Panel Activated by Mouse Position — No Click Needed

The panel should also open automatically when the mouse cursor moves to a corner of the screen, similar to the behavior in MPC-HC media player or FastStone Image Viewer. No click required — just hover in the corner and the panel appears. Once open, scrolling the mouse wheel over the panel scrolls through the thumbnails left to right or right to left depending on the wheel direction. When the scroll reaches the end of the document, there should be a smooth bounce animation, exactly like the rubber-band effect on an iPad. This tactile feedback makes navigation feel alive and prevents the jarring stop at the end of a list.

Click Any Thumbnail to Jump Instantly

Clicking on any thumbnail in the bottom panel should immediately open that page in the main view. There should be no delay, no fade, no intermediate loading screen — just an instant jump. This is critical for users who navigate through hundreds of pages and need to reach a specific section quickly. The thumbnail that is currently active should be highlighted with a border or a subtle glow so the user always knows where they are in the document.

Customizable Progress Bar Below the Thumbnail Panel

Below the thumbnail panel, or optionally replacing it, there should be a progress bar that functions like the seek bar in MPC-HC video player. The user can click anywhere on the bar to jump to that position in the document, or drag the handle to scrub through pages. While dragging, a tooltip should appear showing the current page number relative to the total — for example "10 of 100". This numeric feedback is essential for precise navigation in long documents. The progress bar should be fully customizable in color: a blue bar on a white background by default, but the user can change both the fill color and the background color to match their aesthetic or to improve contrast on different screens.

Horizontal Scrolling with Hotkey + Mouse Wheel

Horizontal scrolling should be supported in two ways: first, by dragging the document with the mouse (like grabbing and pulling the page), and second, by holding a hotkey (for example, Shift) and scrolling the mouse wheel, which would then scroll the page left and right instead of up and down. This is incredibly convenient for wide documents, schematics, or pages with large tables. The hotkey should be user-configurable.

Comprehensive Hotkey System

The application should have a complete hotkey system where every major action can be assigned a custom keyboard shortcut. This includes navigation (next page, previous page, first page, last page, jump to page), zoom controls, toggling panels, opening recent books, saving quotes, creating notes, and switching between viewing modes. Users who work with documents professionally will appreciate the ability to keep their hands on the keyboard and operate the reader without ever touching the mouse.

Advanced Note System with Import and Export

The note system should be deeply integrated and powerful. Users should be able to create notes attached to specific pages or text selections, with the ability to assign tags, colors, and custom metadata. The entire collection of notes should be exportable to a single file (for example, JSON or XML) that can be imported later or on another device. This allows users to share their annotations with colleagues or back them up independently from the PDF file itself. The same export/import mechanism should also work for the program's settings, so that the entire environment — hotkeys, colors, panel layouts, preferences — can be transferred between computers in one click.

Hotkeys for Recent Books and Pinned References

I would like to assign keyboard shortcuts to open specific books — either from the list of the last 10 recently opened documents, or from a user-defined list of pinned references. For example, if a user is reading hundreds of books but always wants to return to a particular dictionary, manual, or reference work, they could assign Ctrl+1 to open that specific PDF instantly, no matter where they are in the application. This is like browser bookmarks but for PDF readers, and it would save enormous amounts of time for researchers, translators, or students who constantly switch between source materials.

Graph Visualization for Cross-References Between Books and Chapters

Here is an ambitious but powerful idea. I have previously designed a system for searching the Torah that builds graphs of connections between different chapters and books, visualizing how concepts are linked across the entire corpus. Why not bring this into the PDF reader? The user could highlight a passage in Book A, then highlight a passage in Book B, and press a hotkey to create a connection between them. Over time, these connections form a web of relationships that can be visualized as an interactive graph. This would transform the PDF reader from a passive viewing tool into an active knowledge management system.

Quote Saving with Hotkey Like CintaNotes

Inspired by CintaNotes, I want the ability to select any text fragment and press Ctrl+0 (or any custom hotkey) to instantly save that quote to a list of bookmarks and citations. Each saved quote should automatically receive a unique ID number and a visible timestamp (date and time of capture) for easy orientation and sorting. The list of saved quotes should be exportable to PDF or plain text format, so that the user can compile a document of all their extracted passages with full source information. This is essentially a built-in citation manager for PDF reading.

Semi-Transparent Highlighting Like a Real Marker

When a quote is saved, the corresponding text in the document should be highlighted with a semi-transparent color, exactly like using a real translucent highlighter marker on paper. The user should be able to choose any color and adjust the transparency level. This visual cue makes it instantly clear which passages have been captured, without obscuring the underlying text. The highlight should be visible in the main reading view and also represented as a colored spine marker on the bottom thumbnail panel, showing exactly where in the document the user has placed highlights and notes.

Connecting Multiple Notes into Graphs

Here is an extension of the graph idea: the user should be able to press Ctrl and click on multiple saved notes to select them, then press a key to connect them into a graph. The selected notes become nodes, and lines are drawn between them representing the relationship. This graph could be displayed in a separate 3D field where the user can rotate, zoom, and rearrange the nodes — similar to SimpleMind Pro but with an added spatial dimension. Double-clicking any node in the graph would open the corresponding book at the exact page where that note was created. This creates a visual map of the user's entire research journey across multiple documents.

Notes List with Dates and Quick Jump

The reader should have a dedicated "My Notes" panel where all saved quotes and annotations are listed chronologically with their dates and unique IDs. Each entry shows a short preview of the quote text, the book it came from, and the page number. Clicking any entry instantly jumps to that page in the main reading view, with the highlighted passage glowing briefly to draw the user's eye. The list should be searchable and filterable by date, book, tag, or color. This turns the reader into a personal research archive that grows with every session.

Split Screen Mode with Side Notes Panel

A special viewing mode should split the screen into a main reading area and side panels for notes. The side panels show shortened texts of the user's annotations, positioned next to the corresponding pages. This is like having the book open in the center and your handwritten marginal notes arranged along both sides. The side notes can be collapsed or expanded, and their width is adjustable. This mode is ideal for reviewing a document with all your comments visible at once, without having to hover over each highlight to see what you wrote.

Colored Spine Markers on Bottom Thumbnail Panel

The bottom thumbnail panel should display small colored spines or tabs on the thumbnails of pages where the user has created highlights or notes. Each color corresponds to a different type of annotation — for example, yellow for a saved quote, blue for a free-form note, green for a connection to another document. This provides an immediate visual map of where the user's intellectual activity is concentrated throughout the book. A quick glance at the thumbnail strip shows exactly which pages contain annotations and what kind.

Unified Backup File for Book, Notes, and Settings

The user should be able to save everything related to a particular book — the PDF file itself, all annotations, highlights, quotes, connections, and even the reader's settings — into a single backup file. This file can then be transferred to another computer, opened with the same reader, and everything is restored exactly as it was: the book opens at the last page, all highlights are in place, the notes panel is populated, the graph is loaded, and the interface looks identical. This is true portability of the entire reading experience, not just the document.

Consideration for MacBook Neo and Mobile Versions

I would also like to see versions of this reader designed for the MacBook Neo concept I have been developing, as well as native applications for Android and iPad. The touch interface on tablets could use gestures — swipe to turn pages, pinch to zoom, tap with two fingers to open the notes panel — while preserving all the powerful features described above. The MacBook Neo version could take advantage of the unique hardware design to integrate the thumbnail panel into the lower portion of the screen in a way that feels natural and intuitive. Cross-platform synchronization of notes, highlights, and settings through a cloud service would complete the ecosystem, allowing a user to start reading on a desktop, annotate on a tablet, and review on a laptop — all with the same unified experience.

RAW IDEA
"The best ideas from RepliGo Reader 4.2.8 for Sumatra PDF. What I would like to see.
At the bottom of the screen — a panel with thumbnail previews of pages, of customizable size..
I moved the mouse to the corner of the screen as in MPC-HC or Fast Stone Image Viewer — the panel opened — without clicking you scroll the mouse wheel and it flips through it.. left and right, when reaching the end — a bounce animation like on iPad.
A click on any thumbnail immediately opens the desired page.
Also, even lower there is a progress bar, it can be left independently from the thumbnail panel.. for example as a blue stripe on a white background.. or customizable by colors.. it is like the player's slider in MPC-HC — you click anywhere or drag and the desired page opens, in parallel the page number is shown — 10 out of 100 for example — while you hold the mouse and drag.
Very convenient navigation through large documents.
Also horizontal scrolling is convenient — for example you can drag, or you can hold a hotkey and scroll the wheel and it will move left-right.
Also, in principle, make hotkeys.
Plus an advanced note-taking system with export and import to a file — by the way, like the system of exporting and importing program settings to a file.
I would even make keyboard shortcuts for opening either the recent 10 books or assigned ones. For example, if you open hundreds of books but always want to return to a specific reference book — assign a keyboard shortcut to it.
Next — I created a system for searching through the Torah, where you can build graphs of connections between different chapters and books.. visualize.. why not create such a tool.
In book A, you select a fragment and with a keyboard shortcut, like in Cintanotes for example Ctrl+0, you save it into the bookmarks list.. so you can select quotes — then export to Pdf or text. And assign a unique number to each note and a visible date for easy orientation, and for example hold Ctrl and select two notes or several and they connect into a graph.. or on the screen with a 3D field connect them with lines like in SimpleMind Pro and then you open a specific book.
You open the "my notes" section and see with dates what you marked with quick navigation to the desired pages and, as in RepliGo, the quotes you selected are highlighted semi-transparently in any color.. like a transparent marker in a real book.
Plus a mode where the screen is divided into the main area and side margins for notes, where abbreviated texts of your annotations are visible.. and also on the bottom thumbnail scroll panel, in the form of multi-colored spines, it shows on which pages you highlighted quotes and notes.
And that there would be the ability to save both the book file itself and next to it the file of all your marks into a single backup file. And on another computer you load the book and the notes file and the program settings file and everything opens 1 to 1.
And think about the macbook neo, which I was developing, and the version for Android and iPad."

Key ideas (highlighted in bold within the text above):

At the bottom of the screen — a panel with thumbnail previews of pages, of customizable size.

Without clicking you scroll the mouse wheel and it flips through it.. left and right, when reaching the end — a bounce animation like on iPad.

A click on any thumbnail immediately opens the desired page.

Also, even lower there is a progress bar — like the player's slider in MPC-HC — you click anywhere or drag and the desired page opens, in parallel the page number is shown.

Very convenient navigation through large documents.

Horizontal scrolling is convenient — you can drag, or hold a hotkey and scroll the wheel to move left-right.

Make hotkeys.

An advanced note-taking system with export and import to a file.

Keyboard shortcuts for opening either the recent 10 books or assigned ones — assign a shortcut to a specific reference book.

Build graphs of connections between different chapters and books — visualize.

Select a fragment and with a keyboard shortcut save it into the bookmarks list — select quotes — export to Pdf or text.

Assign a unique number to each note and a visible date.

Hold Ctrl and select two notes or several and they connect into a graph — or on the screen with a 3D field connect them with lines.

Open the "my notes" section and see with dates what you marked with quick navigation to the desired pages.

The quotes you selected are highlighted semi-transparently in any color — like a transparent marker in a real book.

A mode where the screen is divided into the main area and side margins for notes, where abbreviated texts of your annotations are visible.

On the bottom thumbnail scroll panel, in the form of multi-colored spines, it shows on which pages you highlighted quotes and notes.

Save the book file itself and next to it the file of all your marks into a single backup file — on another computer load the book and the notes file and the settings file and everything opens 1 to 1.

Think about the macbook neo, and the version for Android and iPad.

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And also for the thumbnail panel at the bottom, it can be made beautifully so that when the pages run out, they are displayed in the center. That is, up to half of the screen on the left or right (depending on whether this is the beginning or the end of the book), thumbnails would be shown — this is very visual and intuitive — you scroll the wheel and again there is full filling. And evaluate the idea.

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And one more thought — an advanced search engine like Everything in the form of a launcher, like in Unix, on the start page as a search bar with a dropdown list below that appears as you type, and also when you open any book, the ability to call up such a search bar, like in MacOS, and search both by book titles and by the contents of books with color highlighting of what you find, like in Cintanotes, and also search within the current book, and for example, so that it shows all matches in the form of thumbnails and you could use the arrow keys to switch between matches, and also search inside words and integration with Cintanotes.