I'm a big proponent of improving the damage model of ships in AH. In addition to hits causing visible damage (fire, list, holes), I to would like to see hits on the CV cause an impact to flight ops, similar to hanger damage. Hit the bow or elevator and launches are disabled, but not successful landings. Hit the stern and no arresting gear available (not to mention you better not hit the hole in the deck when you come in). Torpedo hits cause a list and loss of speed; hit with enough torps and she's dead in the water and eventually sinks. AP bombs that hit near the engine spaces would also reduce speed.
In addition to these effects, I'd also like to see several ships added to the fleets, specifically a tanker and an ammo ship. Sinking either would have the same effect as killing fuel and ammo at a field, i.e. reduced fuel and load outs for a/c.