If you feel like a category would be fun, try it out. If other people see you doing it and join in then that's how it could become a thing, and if enough people do runs of it, it may be added to the leaderboards. This is pretty much my standard response to a new category suggestion; try it out and have fun with it. I think it's important to remember you don't need a leaderboard to do runs of what you find fun :)

Can we please get a time trial category for each individual cup along with an 'all cups' time trial category in Super Mario Kart?

Super Mario Kart

Super Mario World Extra Categories

Time trial categories

New category similar to Obroe%?

333Rich333

DanOcampo

AlexPivot

Deakula

Super Mario World

Sheppard Software Geography

MattOUFC