I've been playing Starfarer for quite a while now and it seems that a multiplayer system similar to those in the total war game series would work quite well. Players could decide with each other on a spending allowance then build and combat their fleets, money can be spent on ship hull's, weapons and crew quality. Players could also decide on the level of capture points, asteroids and nebular's before beginning the battle. I think this is a good idea as it would allow players who have pretty much built their idea's of a perfect fleet in singleplayer and don't have much left to do, to put their strategies to the test against other players.