i'd like to suggest an option you can choose where you start a new game witch makes all the ballistic weapons, ammo and armor you start with come in limited quantity, witch in turn also allows you to produce them.
Just something for those of us who want more to worry about when we play
Another minor feature related to this would be that when soldiers die, there's a chance you won't be able to retreive their equipment at the end of a mission (due to damage perhaps).
Sorry if this has been brought up earlier.