Also, E.G., I must disagree with your comment about the Federation only worrying about the defense of Earth, even though Betazed is not one of the Federation’s capitals, it is a major planet, and was taken by the Dominion. Plus, I believe increased patrols occured in all Federation capitals and major planets.
I don’t know about making the Federation having to research some of their most powerful ships. Plus, Ambassador classes, although used partly in the war, were decommisioned, I believe, when the Galaxy-class was introduced.
Also, I’m not real sure about the DS9 rule that you mentioned. One of the great things about Axis and Allies, at least this is what I think, is that you can change history. The DS9 rule would take this away from the game.
Yet when the Federation ws going to liberate DS9 Starfleet Command only mentioned the defence of Earth as a concern and not any other planet. This is not to say that the other planets are not important, it is just that since Eart hsi the capital of the Federation it is the most pivital planet for the Federation to hold.
True, you can change history, but even Axis & Allies has some historical realism to it. This rule would simply make DS9 an important base to hold. You can also make the rule expire if the Federation liberates DS9. Therefor, if the Dominion re-take the station again, the rule no longer applies. You could also make the time limit rather large to allow the Federation a bit of breathing room.