So, just a stupid question, but is it possible to do a "No DLC" run on any but the base game maps? Could you just disable every DLC other than the one the map is from?

Only asking because it seems funny there's all those options on the leaderboard, but they seem like they're effectively impossible.

The current rules make it impossible, but in the future we could just make an exception from this rule in all of the DLC maps individual Non-DLC category rulesets

I don't know of a way to remove them from the board, otherwise I would. No, it's not possible to do a No DLC run on a DLC map.

I added a rule that you have a maps-only run, if the only dlc you have is the map pack then you can run in it in the nondlc categorie(s).