Ability to Rename missions

I browsed through the forum, but I haven't seen this brought up before. Could we have the ability just to customize the names of the missions already in the game? Not many places in the US still have callboxes, etc. and some places don't have manholes. If we had the option to go in and add a custom name, or a list of custom names for each mission to pull from, it would help add to the game play experience, and add "new" missions without adding too much to the game.