I have a few Worlds runs done, but they were a few years ago, Excited to see someone tackle this!
I think this would be an interesting category if it was postgame only. Because this is literally just Any% + taxi moons. Also stop posting new category ideas in the forums and read this: https://www.speedrun.com/smo/thread/yjy3d
I find it funny how you just didn't know this category existed already.
We banned emu a long time ago due to unfair advantages in load times as well as what Rift said above with the hand movements. I think the emu is great for strat hunting, but your actual runs need to be on a console because it is much easier access in addition to the reasons above. Thanks for the question!
This run would likely take days. We currently don't have a category for it, as we're not entirely sure what we would do for a ruleset. Even having All Worlds is a little confusing, adding a full 100% would be that but moreso. If you have a better idea dm me on discord with your ideas.
Sounds cool, but if it was an official category we would probably have to make a category extensions board for it if anything. If you only have the starter pack I would definitely try Original%, it's a good way to get into the game!
Dog% used to be a category on the boards, you got all 5 dogs in Sand, Metro, Seaside, Moon, and Mushroom. I don't know why it was removed off the boards but the mods probably had a good reason. If you want to run it here's the route for you, you just can't put it on the board. https://docs.google.com/spreadsheets/d/12LHhgW_A3XPsRdTv8uxMfOYDQCnJLe54UygQNgd8jVQ/edit#gid=1161685455