Our framework actually assigns each of the four teams different military and political goals. It's set up so that there are two coalitions fighting each other, but each country has its own set of goals (some of which do conflict, creating some coalition tension).

I'm firmly in favor of the umpire/White Cell concept for a couple of reasons. Perhaps the biggest is that it takes omniscient intelligence out of action. Players only know what their collection efforts achieve, and the only "true picture" is kept by White Cell.