I have Libre running on a Pi. Connected to a TV with CEC. The TV remote can do everything except whatever would be the keyboard equivalent of "Escape" or "backspace" so I get stuck in menus and need to use the keyboard.
The remote has at least 100 extra buttons I could map... I'm just having trouble identifying the right way to do it.
I have tried the "keymap editor" addon but it doesn't seem to accept my keys. 