We should have much more customization in this game, here is a couple of suggestions =
Cities: we should be able to name our cities, this could be done by tapping the main building, and then tapping on the cities name. Aloowing you to rename it. (The name of the city should also be displayed on the map)
Troops/ships/aircraft: renaming troops would make it interesting as well, like naming a group of infantry "The 101st" before parachuting them into enemy territory. Or whatever comes to mind.
leagues: being able to upload customized flags, and these flags being displayed on the map.