Heck, I'd be happy if we could just spawn individual player-controlled destroyer escorts. Not much code required there, I should imagine, though we'd need to add torpedoes and smoke generators. You could use the PT boat code as a strating place, I should think. Also, I'd like to see an LST you could drive up to the beach and have it act as a vehicle spawn point. And now that I'm warmed up, how about adding a tanker, ammo ship, and troop transport to fleets to emulate the fuel, ammo, and troop bunkers on land bases? That way, you could selectively take out a fleet's ability to do certain types of missions without having to kill the flagship and wait for the respawn.
P.S. Loved "Space Battleship Yamato" (a.k.a. "Starblazers"), too. Me and a few friends have been trying to come up with a MMOG loosely based on the concept (though not the storyline). I'd post a picture, but I don't have it on a website I can link it too.