[Accessibility] Add buttons or keymap to UI

[Salvatos]

For accessibility and convenience, I think it would be good to either have on-screen buttons to perform the actions described in the FAQ, or at least a togglable panel that shows the keyboard shortcuts within the program.

In the same vein, if you could map the numpad Enter to do the same thing as the main Enter key, that would be really helpful for me since it’s easier to reach while I’m front of my midi keyboard next to the computer :)