To compliment variety in FIA appearance i would also like to see some changes in tactics. FIA tactically are a mild threat. They are very predictable, vocal, stationary they are in the same places on the map every single round and often the only question is whether you kill the rocket man before or after he gets the shot off.

Personally i want to see FIA become a bigger factor in the game not just at the start but through the whole round. I want to see them mobile. I want to see them patrolling with and without vehicles along common roads, routes, and paths. Even delivering supplies or reinforcing bases under attack that get called in over the radio. I want to see the FIA more alive and to gain some of these new AI skills that the US and SU are getting like driving.
I want to see FIA set up in more effective ambushes, i wanna see hit and run tactics, i want to see FIA fleeing to regroup on another point when presented with a overwhelming force, or pushing offensively when given an advantage.
As a player i want to see and observe patrols. Encouraged to take new routes in order to avoid contact. Engage in my own set up ambushes. Steal supply from convoys. I think it would be awesome to engage a FIA position take out the majority of forces, only to find a radio man had called for reinforcement. That reinforcement would come from a FIA base and travel in real time to try and support or recapture.

FIA could add a lot to the feeling of Everon being alive. That the conflict is beyond just direct actions of either player team by capturing bases and progressing to the next base. Where the local inhabitant's are still a threat and pursuing their own goals while attempting to slow the progression against impossible odds.

Civilians would be cool too, but I'll leave it with FIA for now.