why not? because of the arm7 issue?
SNES specs:
CPU: 16-bit 65816 (3.58MHz)
RAM: 128KB, 64KB Video RAM
Colors: 32768 (256 on screen)
Resolution: 512x448 pixels
Sound: 8-channel 8-bit Sony SPC700 digitized sound
GBA specs:
CPU: 32-bit RISC-CPU (16.78MHz)
RAM: 32KB, 96 KB VRAM (in CPU), 256KB external
Color : 32768 (511 on screen)
Resolution : 240 x 160 pixels
Seeing the difficulty of just getting SNES games running on the DS, sadly, the difficulty in emulating GBA games on the DS is that much more difficult. That's the reason for passing the GBA rom straight through (as in no actual emulation) but then sending the result to the Arm9 processor for further instructions, such as full screen enhancements, or wifi GBA-Link games, etc...