Well, we'd mainly just threaten dire things for both sides if they don't break it up. If they didn't in fact break it up, we'd try to carry out those dire things until they did. The old adage of peace through superior firepower applies here, sort of.
The point about one cruiser is a good one. We'll probably just make that the flagship, Commodore only. Or have one stationed in each operational zone.
Also, we could mediate forum discussions outside of the game.