I was thinking the other night I'd kind of like to see the naval part expanded and deepened a little more.
I'd like to see carriers knocked out of action (their flight deck wrecked) as it should be, rather than either being sunk or being fully capable of laucnhing and recovering. With damage control being able to repair them after a while (within reason) or if they weren't sunk, they'd respawn as newly repaired and fully operational faster and further out.
I'd like to see a wider variety of Task Groups, with regards to size and composition, and I'd like to see the lone CV or CV with two destroyers eliminated, since no navy in their right mind would send a CV out alone or with a destroyer or two.
Task Groups spawn from deep within a country should have the largest force, and smaller groups should be available closer to the front, in a progressive graduation, the closer to the front the smaller the group. Of course, the country should maintain the ability to spawn the big groups but to a lesser extent as their territory decreases. Start with the port(s) nearest HQ having a Task Group with two BIG battleships, two medium battleships(I know we don't have battleships at all, yet), two cruisers (mixture of heavy, medium, and light), four destroyers, and two carriers. By the time you reach the front lines on a big map you get one (or none) medium battleship, one cruiser (or two if no battleship, one medium and one light or one heavy), two destroyers, and one carrier.
I'd like to see a slightly more complex ship damage model, meaning it would take more than just tonnage of ordinance to sink one. As in it would take hits in the right places with big enough bombs to sink a ship.
I'd like to see large (Iowa class and their predecessors, and/or Yamato class), medium battleships (Bismark and Tirpitz), and three classes of cruisers (the Hood and the Indianapolis for example) added.
I don't see the need to make the ship models terribly complex, meaning they don't need to worry with a complex watertight door model, but the magazines should be there, as should the fuel and the engine room and boiler room. The armor belt should be there as well. Just complex enough to make it rewarding to put the right bomb in the right place. Put a 2K armor piercing bomb into the powder magazine and all it takes is one. Or into the hangar deck.
I think it would make for some really massive pitched battles in the air and on the sea for the big task groups. Some variety, and some strategy added to the naval segment to give people more reasons to get serious about attack and defense of a Task Group.
All this would be real valuable later as TOD went to the Pacific theatre as well, so it wouldn't be "wasted" development time or truly be a detriment to getting TOD going, but rather a semi parallel sort of thing that could be added to the current game as a patch or a succession of patches and be used in TOD as well.