What would really be cool is that after you have engaged in war with other players, there should be an option were you and the other empire sign peace treaties . In the event that the treaties are broken, other empires that are allied with the nation being attacked have the right to intervene. And other consequences can be put on the empire that broke the treaty. Like a slight decline in economy, or like units they control defecting to the opposed empire. I feel something like that would make the experience more immersive. That's just my opinion though.