Honestly I don't think that Snake would be too much of a problem. I've been keeping up with the discussion in the back room, and very few have talked about Snake. At the moment Fox and Ike are the shining stars, as wavedashing brings waveshining back, and Ike with less lag is quite a beast.
I also don't think wavedashing is very buggy. Yeah, it looks weird, but it looked weird in Melee too before people got used to it. It also seems like S-canceling is preferred over L-canceling, as it does a handful of things. 1, S-canceling is more effective at canceling lag than L-canceling, and 2, it homoginizes everyones aerial lag (makes everyone have a static amount of lag on their laggy moves when it is canceled). S-canceling really opens up doors for slower characters like Ike, Ganon, and Bowser.
The hitstun code might be a bit too much at the moment too. There are a lot of things up in the air really, but it all looks very promising.
Oh, yeah, Samus... I don't see how Samus is godmode with hax. All of her aerials autocancel anyways, so she would actually be worse off with S-canceling. She might combo like a badass though with the hitstun code though, which would make up for that quite a bit.