I don't know if this has been suggested before, but Ulletical has created some good gun range type workshop maps. Maybe those could be put under miscellaneous?

http://steamcommunity.com/sharedfiles/filedetails/?id=963274436

http://steamcommunity.com/sharedfiles/filedetails/?id=1322544593

We have other csgo leaderboards for the coop maps on this site, I'd defiantly like to try these out and probably add them.