The football fans would be better for Urbanians than for Centralians :D .
I like the idea of mafia.
IIRC Russians went after Chechnya because of activity of Chechen mafia.
I love OPFOR, because it creates a lot of opportunities for interesting stories. For example, one side can be a drug lord or mafia or terrorists or simply a local government.
I played a scenario today where a clan was genociding a town. I used one clan command and a rifle team mounted on two technical pickups supported by an insurgent pickup and one warlord, three rifle squads, a sniper and five technical cars to genocide ten armed mobs and five unarmed mobs.
Systematic annihilation of the mobs took some time, but was a great way to relax. When the game ended, they had over one hundred wounded and over one hundred dead.
One of the pick-up gunners had forty one kills.
Also, I love using a low-tech Montanyan force (i.e. using T-55/62, BTR-60 and BMP-1) against Centralians :) .
Personally, I would gladly remove the Urbanian and UK units, because they are so boring XD . Army could be replaced with high tech Eastern European forces.
Another force type that I like are merceneries. I created a mercenery company - F- Futurians. They have a weird organisation - base-of-fire teams that have multiple M-16/M203s, rifle teams with M-16s and a full auto M-16 instead of M249 and assault teams with M4s XD .
They us M-113s with M2s/AGL/Javelin for transport :D .
Without social solidarity manifested in the form of welfare state, people inhabiting one territory are a non-nation of mortal enemies engaged in competition for survival.