You can do it now ... you'll just have to play it manually. It would be nice to see best ball, Nassau and Stableford formats; but in order to do this, you will need to incorporate posting finished game scorecards and manually determine the outcome.
Currently, CC Tourneys are single player games, so you'll have to play your games outside of the CC and invite players to join in. Maybe someday, but I wouldn't hold my breath.
Kat