I am curios if or how to make a new category extension. I am new to speedrunning mario 64 and speedrunning in general. I want to run the category of throwing the baby penguin off cool cool mountain but it does not exist.

would be like 3 minutes there's no point

You can run a category without it being on the leaderboards. Since you are probably new to speedrunning, I would just do stuff like this or even individual levels to get comfortable with movement before you really start getting into 70 or 16 star or something.

this would be a funny but pointless category similar to nipple% on smo but it would be a fun addition