32x should be possible, all they'd need to do would be to add support for it into the megadrive emulator, then release some type of cartridge adaptor so the carts actually fit.
im more concerned about handheld compatability, why no neogeo pocket, wonderswan, game gear or lynx support?
last time i tried, 5-6 years ago, emulators for those were pretty good, if not perfect.