it works on mame 0.5 or 1.0 that game is fun you get to be a white Micheal black Micheal and finally Red Micheal. at least it's better then that sega gens piece of crap version. hell if i want to get my mame fix i may get mame back on my wii... i doubt the next retroarch is going have the mame on it...
The MAME 0.78 libretro port is already there - the reason it's not getting bundled in with the next RetroArch point release is exactly because it isn't yet a satisfactory release for my standards (lots of endian issues that only manifest themselves on big endian right now, issues on systems that don't support unaligned memory access).
And the MAME ports you have on the Wii right now are totally inadequate for running any kind of mid '90s games on it at tolerable speeds - so sorry, given how the Wii scene is shaped up right now (it's basically dead - no offense), I don't see you having many options other than to wait for me to get the MAME 0.78 libretro port up to the standards where you guys can 'consume it' on big-endian machines.