Honestly, Sword Canceling is the same as gundashing and deceleration cancel. Not only are these tricks easily done on accident, they are really just minor abuse of priority in the code.

I haven't watched the person in question run the game. But I wouldn't be against adding the category. Tough I'd allow deceleration cancel with the gun (doesn't even save much time)

I'd really rather just make a no-flight% category, though. Forbidden would be:

• Out Of Bounds
• Anything flying related (IJs, Scythe hovering, Boomerang hovering) everything else would be allowed. Including things like:
• Chainskip
• Horse-height increase
• increased height by blocking (even after getting air dash)
• Getting Choking Grounds Armageddon piece early

I am not 100% sure on how to handle prologue in that category. Well... I would allow it but that would differ strongly from a glitchless run (getting extra health, etc).

Cheers