SA-1 chip is mostly (not fully) emulated by PocketSNES on native. The only SA-1 game i tested here was Kirby's Fun Pak and, with a full overclock (433Mhz) and sound off, all i got was 10~13 FPS.
So, i don't suppose the dingoo is the best choice in case you want to play the SA-1 games, as they will most likely be damn slow. Altough, you can always test it under dingux, something i never did (hmm, i should do someday).
Also, dingux is A MUST on the A320, since there is a LOT of apps, games, emus and other stuff for it.