What we did was take a Sega Genesis controllers and then solder two wires from the UP connectors to the the third "C" button it had that Amiga didn't use.
Up still worked as normal, but pressing "C" was now a "Jump" button too.
This made most all Amiga games way more playable.
i did that recently, you can still buy new old stock genesis controllers on ebay for about $5. Platformers in particular are more playable this way, for me anyway, as are driving games (where up on the joystick is forward)-as you don't end up with an arthritic wrist.
