Allow players to play versus AI while waiting for a game.

This is a major undertaking and maybe too late in the development cycle to implement but it would be great if I could play in a game versus the AI while waiting for say, 3v3.  Once there are 5 other players similarly waiting for a 3v3 game it would kick me out of my game versus the AI and drop me into a lobby with them.  I don't mind dropping out of the game with the AI, it's just something to do while I wait and I don't particularly want to sit in a lobby with 2 people in it waiting / hoping for 3 more to join.  I would rather be doing something else in the meantime.