Certainly would be great to see a more developed Super Power and Military Career path, where there were both benefits, and consequences of Rank.
Mercenary behavior permitted but the more you entrench yourself to one side, for the benefits, the more the consequence of not supporting them the next time.
Those with Dual ranks will just time themselves having to make a decision to pick a side and see their rank and benefits there of on the other side degrade with each choice.
Ideally I would see all ships available to all Cmdrs, be it at a mark up for non aligned Cmdrs, and a discount to aligned Cmdrs, and the Ranks and medals and such offering other rewards, such as Sidegrade modules, the Engineers that require Super Power Naval Ranks, Decals, Liveries, special missions, special material brokers.
Mega ships would make perfect Fleet Hubs
Imagine the Indefatigable Class Dreadnought Megaship which only allowed those with Federal Rank to dock (ala Engineer bases) flanked by 4 Farragut Battle Cruisers as a POI when you could dock, get offered Military Missions, access to the Federal Navy Engineer work shop etc etc.