My friends and I have been running a category of fastest time to build the word "BRUH", and I would really like to see it as a sub category

That specific category is not going to be added. If the community wishes to create a google sheet or something for category extensions that are too ridiculous or boring to justify having on the category extensions board, then they can. Categories are only likely to be considered if they involve interesting routing and are fairly long (10+ minutes at minimum?) If you have a category like that, I recommend doing a few runs or races of it so that there are at least a few different people who have completed a run of it, then bringing it up in the discord.

Why not try jumpless%?

https://forms.gle/fXw3vaopU94pfST26 use this form