Hacking Speed Button GBA?

[Intimidator88]

Alright so im playing gbc games on my m3 and i love the speed button on it (the L button) and was wondering if theres a way to set a speed button on gba games? Im using the m3 with the gba exp pack to play them if that helps.

 

[thedicemaster]

not possible.
GBA isn't emulated, the DS uses GBA hardware to run those games and disables any hardware not originally present in the GBA.