OK...tried out beta2 for a bit. Noticed the SMB3 ending curtain glitch is still there. Also I don't remember off hand but was it possible to use save states in a FDS game? I seem to recall it being disabled if you loaded an FDS game. I was able to activate a save state (in Vs. Excitebike) and the game froze immediately. I was kind of expecting it not to work, but I'm almost certain it just flat out didn't work at all in v16.
Might want to go ahead and re-disable that in beta3 onwards...