C&C Generals + addons had an interesting concept with the Commander adding/disabling units in your core army. It gives a different flavor to each game.
But it doesn't change the fact terrorists guys (didn't even remember the name of the faction) didn't had heavy tanks or air capabilities.
So as far as I can think, a interesting design move would be a trade-off arty for another piece of OKW arsenal, disabling Panthers or the KT for instance. But that could lead into a nightmare to balance. OKW is a faction lacking of arty like USF is a faction lacking of heavies. And you should bear with it. If you want to play arty, play another faction.
