I had seen that a Tomahawk Cruise missile was worked on in ARMA 2, but never fully developed for release. I think this would be an interesting addition.

I am not sure how much development has been done in regards to Naval battles. I think adding a compliment of ships and weapon systems could make for some interesting game play. Having submarines, aircraft carriers, destroyers, etc could make for newer styles of game play. Using CWIS and VLS could add to some fun battles.