That's actually one of my reasons for preferring standalone emulators on Android. My device's hardware L and R work by emulating screen touch, and the touch pos

That's actually one of my reasons for preferring standalone emulators on Android. My device's hardware L and R work by emulating screen touch, and the touch positions are assigned per-app, so with something like RetroArch it would be a pain to make sure an appropriate L/R target is in the same place for each emulated system.