Yes to battleship. I think it a more critical addition to the ship set than a CL (i.e. light cruiser). Even more important, however, would be the addition of auxiliary ships, like a tanker, ammo ship, troop transport, and LST -- these would be analogous in function to the fuel tanks, ammo bunker, barracks, and VH at airfields. More targets 
, and more ways to affect CV and amphib ops.
+50 that sounds liek an excellent Idea
