I've recently got myself rockbox for the Sansa Fuze+ (version 3cb0d71-120409) [I've already searched the webs]. I've copied a gameboy rom onto it, hoping to play it in sessions of boredom.
However, I've found a small thing:
When assigning keys to the touchpad, I can assign them all as I wish. That means up down left right to the arrow "buttons", and usually back/play button as the a and b buttons. Vol. up and Vol. down would then be start and select.
However, when I use this key binding, pressing the "a" button while also pressing a movement button, the current action is interrupted (like using a shield in Zelda, Link just stops and puts down the shield). This only occurs when I assign the a & b button to the touchpad. When I change the binding two the vol. up. button and the vol. down button, everything works fine (-> Link runs with his shield like he should).
Long story short, when I try to use two keys of the touchpad at once, it won't work, because the current action will just be interrupted. I doubt this is due to the rom. Gonna try to reproduce it with other games later. Has anybody made similar experiences on this mp3-player?
e: Might be because the touchpad can't handle multitouch. Too bad.