I suck at smb1. Are there any category’s where switch rewind is aloud? If not, is it possible that a misc or extension category could be made specifically for this. I really want to upload some any % runs.

I mean, that's literally cheating by using savestates. My only recommendation is that you watch slow runs (around 5:30-5:45) and try to replicate what they do

Study the strats that Miniland uses. It really gives you a whole new perspective on optimization in the game

No.