(1) in both the My Games list and in the actual game window, put an icon to signify which players are logged into CC at that time. That way we have an idea who might be ready to go so we aren't sitting and refreshing the window constantly.
(2) Institute "TURBO" games as an option: players have 8 hrs (maybe even less) to take their turn. You could add a "REALTIME" option where players have 1 hr to complete your turn and the game starts when full. There is no time between turns: when player A's turn ends (whether he took 15 mins or the whole hr), player B's turn begins and his timer starts ticking.