I saw a comment about the benefits of a team moving its capital to the mainland, to open trade with everyone else. That seems a bit scary, but it made me think of a question. Can you create colonies in MP games? If you create one, do you retain control over it like a vassal? This might be a mechanism for opening up trade routes that would not involve a capital relocation. Or maybe colonies are a bad idea in general -- I don't know, have never tried it...