The big question is, odes anyone here know how to code these "plugins" and, does Elsemi feel ok about someone else doing his work? For the latter question, I think he's not ok with it. As for Nebula being the definite Neo-Geo emulator, some people just don't share your enthusiasm, image filter-wise or in some other aspect of emulation. Furthermore, if someone makes these kind of challenges, he should be ready to take part himself, wouldn't you agree?