Personally, I think that while it's certainly an interesting idea there isn't really any way to actually do this. We'd not only need a way to guarantee getting every map one after the other but also a way to guarantee getting the same role for each of those rounds (and yes I know there's a gamepass to alter beast chance but I'm not adding a caregory that requires anything you have to pay for in a free game).
Thought of this idea too, but as Neo's point still stands. I would also say and Map Number% (basically a certain number of maps for one category, like a Facility% where players would speedrun though Abandoned Facility, Facility_0, and so one in one go to take as an example). There's two main problems here: Players in the run and Maps that keep getting updated or removed. A whole leaderboard reset would take effective depending how different the maps would be.
So for example: If Airport and Backrooms both had a map% category, it would be removed due to those changes. So although this idea would be fun, sadly there's no way to fully implement these without these issues put in place.
