This is just an idea, but what if we could be able (in a plugin maybe) to post our schedules as to when we think we'd be available or unavailable?
I'm a student and I have pretty regular chunks of time when I am available to get onto CC. The function would allow us to post our schedules and then it would convert it into the time zones that the other players are in--so if I have my time zone set to "EST," I would then view the other players' schedules in EST as well.
We could also post when we know we might be gone for long periods (friday and saturday nights, etc).
The result is that we would have a better idea when people would or would not be taking our turns (something that non-premium players would like to know). We could also coordinate better to be online when the other players are more likely to be on in order to take many turns in a chunk of time.