This is a very good tool indeed but there is just this minor thing (which is a HUGE deal for vim/tmux users out there): Backspace and Ctrl-h are emitting the same key codes: ^?
Backspace should be ^? and Ctrl-h should be ^H. Otherwise, you could not jump panes/splits to the left of the active pane/split. More generally, it would be very nice to be able to make a custom mapping for these problematic keys (Backspace, Del, Ctrl-h or any key combination with Ctrl). I could see that you already allowed this with the Alt key which is great. Thanks!