Hey thanks,

So, do you need both Hotkeys on P1 and P2 mapped? Or can you get away with P1 only?

OK so I understand forget the keyboard interface....but does my comment about FBA Libretro and MAME using the joystick inputs differently seem correct?

Actually, FBA Libretro is just not usable. MAME works with the GPIO joystick config done inside ES. Libretro doesn't, so I guess libretro only works with SNES controllers and the like, definitely not with GPIO. So I guess I am off to figure out core remaps....which doesn't sound fun...