Yeah, touch screen works (set port 2 to zapper), pretty sure you can hook up a mouse for stuff like Area 51. Touchscreen works there, but like a trackpad instead of direct touch. SuperScope works as direct touch also on SNES.
Really wish there was gyro mouse control in RetroArch... I dunno, light gun games sort of fascinate me since they're so difficult to preserve. I'd kill for a EmuVR type setup for LaboVR...