Right now there is a blanket rule that all sim mods make a game unrated, with very few exceptions (RKs Explosions is the only one I can think of, and I'm not even sure about that one).
Are there any gameplay mods you'd like to see rated? Should we have rated Phantom or King of the Hill games?
We can rule out any unit mods like BlackOps or TotalMayhem. These mods completely change balance and feature far too many potentially controversial changes.