although looking around I don't think they want any more categories at the moment because of the number of categories without any runs or only a few runs.

pretty good idea, everything Overwatch based isn't really changing much at the moment so not many categories have been added in a long time but I imagine this will change once Overwatch 2 comes out. I personally just want some more subcategories in certain current categories. like a duo version of the A-Z speed run in the practice range or a 4 man all maps co-op category. and 50 kills no setting manipulation duos... there are lots of possible runs that could be put in and yours's is a great idea, it is something which we have all done while waiting in the spawn room and interests a lot of players.