What is the problem?
Just a random thought, it would be cool if, on the homepage, after entering long link and alias, you can press Ctrl + Enter (or Cmd + Enter if on Mac) to submit the short link instead of having to move your mouse to click on the submit button. This would benefit power users who want to create a short link quickly.
Your solution
I believe this can be done using browser APIs.
Alternatives considered
Shift + Enter is also another possible keyboard shortcut.