What about doing a full-game run without collecting any coins. Saving and loading different files is allowed as long as your only using files created in the same run

/edit: Could be any%, Dark Side, Darker Side and World Peace actually, maybe add these as sub-categories?

Wasn't that one coin for the second story moon in Bowser's Kingdom unavoidable?

It is for now but maybe we could clip into it

Maybe do a 1 coin run then?