This is literally useless, but maybe we can do something with it? I have no idea, I've never speed run Mario World. (This was done on my SNES Classic)

Coolio. I've seen this used when trying to get wings on as many stages as possible. So yes it has been seen before. Cool that it works on the nes classic too. ^^ Do you know about zips by the way? The trick used in Star World 1.. because that trick uses the same mechanic that you used here. :)