Count me in. +1. However, if they're going to be in the MA, I feel there needs to be a strategic and/or tactical reason to attack, and defend, them. An analog would be trains between land-locked strat. Unfortunately, even when trains were a part of the game, few bothered to attack them.
A more relevant use for non-combatant ships, suggested before, is to have combat support vessels added as part of the fleets. They would take the place of the ammo bunkers (ammunition ship), barracks (troop ship), and VH (LST) targets at land bases; destroying them would have the same affect as with a land base (and they would rebuild in the same fashion, as well). I'd then up the damage required to sink the flagship.