To sum up, if they choose for a restart on such engines it won't be that easy at all. M.U.G.E.N. has all the things I mentioned above already set up(even the right number of variables). Basically all you gotta be worried about is the fighting system cuz the rest is controlled by the limits that M.U.G.E.N. imposes.
Not trying to fight here just showing the facts. I wish all lucky for them!