Jimbob people are going to argue about what ships can and can't do even if everything is taken right out of the game. Someone always posts something a little too extremeno matter what presidents are set beforehand (Skyblde calling foul right after he had tried to capture our capital without even fighting the defense fleet comes to mind). I think that as long as we dont allow new weapons and tech everyone will get along reasonably well and any problems that do come up can be resolved easily. Think about it, in BFS III everyone was constantly arguing about who's missiles did more damage, or whether the plasma beam cannon did more damgage than the fusion beam... and almost everybody had their own ideas about the tech. As long as we dont introduce any new tech everyone will know from experiance what the ships can do.
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Out ride the sons of Terra,
Far dirves the thundering jet,
Up leaps the race of Earthmen,
Out, far, and onward yet - Robert A. Heinlein, The Green Hills of Earth