I have three suggestions.
1.) if you read the RISK manual, it talks about "secret armies" If think cc should have this feature.
2.) i think that when creating a game, there should be a feature where you can type in a description type thing like "rt game only!" so that people joining would know that this is going to be an rt game. Of course this feature could be used to explain other things like "clan war".
3.) Add two text boxes to the top of the "join a game" page. One says "game number" and the other says "with player". I realize that these are already in the gamefinder, but these would be very convenient to have at the top of the join a game page.