Undo is also mapped to C-/ by default, IIRC. About the window switching, I've remapped it to M-o, and M-1, M-2 and M-3 to do splits, etc (I use this more often

Undo is also mapped to C-/ by default, IIRC. About the window switching, I've remapped it to M-o, and M-1, M-2 and M-3 to do splits, etc (I use this more often than repeat commands, so it makes sense)