I've recently got quite a few ideas for categories, some already routed and tested, some just ideas.
One of them is a category I'd like to call "Spawn%". Basic rules: Beat the game as fast as possible while only collecting previously spawned Moons. "Spawned" is defined as in the Moon has to go through an Up-Down-Animation before you can collect it or you get the Moon by talking to certain NPCs. Storymoons are always valid.
Now, from what I've constructed in my head, there are quite a few routing options, however the basic route would be pretty close to the Any% route. Therefore, before I spend hours routing stuff just to get a rejection; @MODS do you think this category has a chance on getting added, even though it may be just a bit similar to Any%?
In my opinion, it's kind of a bad thing that all full game runs are either heavily influenced by RNG (Endless) or last for at least like 1:40h (Storymode). So what about a shorter skill-based category including like 5-20 Levels? One of the first things that came to my mind when getting this idea: The SMM2 Invitational Levels.
In case you are unaware, it's a series of 6 Levels used on an event, shortly before SMM2 was released (I think). They are all uploaded on the official Nintendo US Maker account and their individual WRs sum up to roughly 2:32 Mins. Together with roughly 5*20 Seconds loading time (assuming you're playing in coursebot), you'd get a 4-5 Minutes speedrun, which I think would be a nice challenge (;
Furthermore it'd also be a nice reference to the SMM1 speedrun.com site, as there already is a pretty similar category called Nintendo World Championships 2015 Courses :D