I don't see what's so wrong with treating a destroyer/light cruiser...hell, *any* naval vessel short of a Carrier as nothing more then a super-sized PT boat.
Can PT Boats have gunners? I thought so, so have a friend help ya out!
when you get into big ol' capital ships, however...that's where it gets dicey- a HELL of a lot of vehicle points to raise the Arizona, as it were
I can see a destroyer being spawned at the carrier group, but a cruiser or anything heavier should probably be limited to the ports.
Imagine the terror the other side would feel when you roll around an island with a full fledged Iowa, all 9 16 inchers aimed ominously at the airfield

*edit*One thing to keep in mind- the Carrier fleets are actually just moving airfields- that's how you get the multiple gunner positions, etc. The above suggestion/wish would simply be for a vehicle type interface, with a group of positions (1 being the flybridge/pilothouse, 2 being the big guns, 3 being AA Battery 1, port side, etc.)