Sonic Advance 2 does not run (black messed up introscreen)
That's a bit surprising to hear considering reGBA can run that game on the RS-97 & GCW0.
That game though does require that you change the "Boot from" setting to "GBA Bios".
Btw while i'm here, there were some games like Kingdom Hearts in GPSP 0.9.1 where you could bypass the FMV intro by loading/saving after it crashes during the intro. Such a feat doesn't work with reGBA though.
Perhaps that's something worth looking into ?