Using the SMB3 Randomizer, it is possible to generate a vanilla rom with the only difference being autoscrollers have their autoscrolling removed (all levels (except 5-9), airships, and military stages). The easiest way to do this is to enter the flags 2WA!. The seed does not matter, but for consistency I would recommend setting it to 0 to keep the hash on the title screen the same: Flower, 1000, Mushroom, Note Block, 1UP, Star.
I think these two main categories would see the most potential with this change and would make for great category extensions, since runs would be faster in general and it'd be interesting to see what new strategies people can come up with on the disabled autoscrollers.
Edit: An IPS patch was created by narfman0 so using the randomizer is no longer needed. You can get it here: https://github.com/narfman0/romhacks/raw/master/Super%20Mario%20Bros%203%20noauto.ips
Cool, I just made a patch myself too: https://github.com/narfman0/romhacks/raw/master/Super%20Mario%20Bros%203%20noauto.ips
I haven't tested it at all... I wonder what "some" autoscrollers are and why some can't. I'm guessing some break the game. I'll have to see the difference :)
I gave the patch a try and looks like it's the exact same one generated with the randomizer (even the hash on the title screen matches). I'm open to using it over the randomizer since the process will be easier and more familiar to people. Thanks narfman!
The only autoscroller in the vanilla game that is unaffected is 5-9, since it is a bit more unique than the other levels. Not sure about the technical details, but maybe one day it can be removed as well (even if it required a p-wing to finish).
It's been a while, but I recently got with fcoughlin (the creator of the SMB3 Randomizer) and I was able to convert his changes to the autoscrollers into its own patch without modifying the title screen/messages. I also disabled the autoscrolling on 5-9 by default, making a tail or P-wing required to beat it.
Since it is technically considered a hack at this point though, I think a new leaderboard would need to be made instead of making it a category extension.
It's been a while, but I finally have a long awaited update. Over the past few months I've expanded this concept even more to improve the speedrunning experience of vanilla SMB3 and now I am happy to announce my new hack, SMB3 Speedrunner's Edition, has its own leaderboard: https://www.speedrun.com/smb3se
You can read more info about it here: http://www.romhacking.net/hacks/5050/, but to summarize: -All autoscrolling has been disabled. -Hand traps can now be countered through the use of items (a star or music box) -Bad hammer bro RNG is essentially eliminated by modifying their movement and making minor tweaks to the maps as needed.
It's been met with overwhelmingly positive feedback from many vanilla runners (including mitchflowerpower), so I encourage everyone to give it a try and let me know what you think.