Is the most common sense idea, put a "Rogue" faction that have all the trekier wanna-have races that doesn't have the other two factions. But iit would be "extraordinarily" non-canon from cryptic, so I don't think ever gonna happen. Romulans are homeless and Cardassians with not much diversity. I see sooner Cardassians and…
I agree that nearby anything must be tradeable in the exchange. But marks... for me good, i need to farm a lot of money right now xD But I don't know any game that allows the trade of marks, the marks is a way to make sure the players throw time in the game...