As DCR said, the closest thing to your category is Glitchless on the extension leaderboard. The rules can be found in the description of the leaderboard. This is the current world record by Edzan https://www.speedrun.com/mpce/run/y6p9wjpm

As far as your category, it is(in general) the community's opinion that we have more than one person run a category before we make a leaderboard for it. If the moderators allowed anyone to make their own category the extensions leaderboard would be filled with a bunch of people who made their own category.

If you set some very clear rules for your category and had a few other people in the community interested in running your category, I'm sure DCR would give more thought to the idea.