In terms of pop cap, here's some idea's.
1. For online games, make a Team Popcap. That way if one player drops out, the others can still play fairly.
2. I like popcaps, but maybe have a way to exceed them. For example if you attack Coruscant, it will (or at least should) be very heavily defended. How about you have the ability to bring down say popcap(x)1.5 (or 2) units, but if you retreat you can only bring back the units that fall within the cap?
Okay what I mean is instead of landing 20 units, you can land 30, but if you retreat even getting all of your units back to the reinforcement points, only 20 can be saved.
Dark Lord of the Purists
Inter Arma Enim Silent Leges