Makes no sense to me that TG and CA can run around in each other's strongholds.
I just had another idea - maybe to help populate multiple zones in the city, give each zone a specific bonus. Maybe even to certain pro-city factions or make them faction/ally specific. For Example - P1 perhaps give a +imp bonus, being a big medicare building. P2 some different tradeskill bonus, same for P3 and 4. Maybe this would help spread out the population and give the city some more life, and encourage competition between tradeskillers. Maybe for PP have different kinda of bonus, maybe slightly higher barter and other boosts - but this comes at the risk of it not being a safe zone.... opinions?