Thank you! I must credit Alex Diener's gamedev videos for introducing me to the idea of seamless transition between different controllers. Without it I am pretty sure I wouldn't have bothered to add non-mouse controls to the game at all!
Sorry about the `z/x` confusion, I only noticed today that they're in the help file but don't actually work. Got it in my todo though!
(Btw, that earlier report you made about hud buttons getting pressed in weird places is fixed and will be released in an upcoming update)