Is there an existing issue for this feature request?

• I have searched the existing issues

Is your feature request related to a problem?

When configuring the source of a new input or mix, you can press buttons on the radio to automatically select them, but if you want to select a trim button as an input, this shortcut doesn't work, and you instead have to scroll manually through the list (and know which symbol represents the trim input)

Describe the solution you'd like

Similar to other input buttons, pressing the trim buttons while the Source selector is active should directly select that trim switch as the input.

Describe alternatives you've considered

You can manually select the trim switch from the list by scrolling, but this has poor discoverability and is not intuitive for new users, especially on black&white screens where the symbol for trim inputs is non-obvious, and users likely would assume the input is unsupported if it doesn't auto-select when pressed as other inputs do.

Additional context

This behavior was observed on RadioMaster Pocket running EdgeTX v2.11.4 (and previously on 2.11.3).