Doing it this way would make people have to download maps all over again if we just want to change 1 thing in the mutator. The mutator would have to be downloaded, but it's very small, and can be downloaded using the fast ingame downloader. Maps on the other hand.... they won't download unless you join the server when it's being played. If the map is voted in at the end, you will be kicked out of the server by the game.