I believe, with all my heart, that the addition of the ability to customize the Ghosts AI in single player mode will greatly increase the reputability and appeal of the game.
Though I do enjoy the online COOP mode, I'm more of a single player guy, so it would be nice to have this option.
Another addition that would be amazing is the ability to change the time of day.
That way you can do night raids whens you want, or have perpetual daylight to view the awesome designs of the landscape constantly!
Those are the only two things I suggest.
