Make changes that could be selected in the Game XML.
The change I'm Looking for would have specific
territories produce Partisan units (Very weak Infantry
unit) with this system selected for you should be able
to specify in the XML units that require a Partisan
unit to build. The units would have to be in a IC and
would disapear during purchase phase if used. Then you
could use these to limit production of certain units
like regular army, marines and any other the game
developer desires. If this was turned on you would
have to mark in the territory a seperate value for
Partisan production like IPC value.