Other options : (not necessary cumulative)
- When a zone was taken, it cannot be took again for one hour.
- When you just took a zone, it become crowded by your militia for 30 min, then their population decrease during the next 30 min.
- You prevent people from entering Phoenix through the gates of other factions. (but still allow escape)
- The zone you take must be connected to your gate.
Let's say you are V-TEC, you can take Vault-Tec Enterprise. Then, if you took Enterprise, you are allowed to take Global Electrics/Rocbo/Gunn Runners. When you have Robco, you can take Maryland Avenue/Hospital/Sun City Grande. If you lose Robco, but have Hospital, you can keep it/defend it, but if someone take it from you, you have to take back Robco before taking Hospital back, because the link between Vault-Tec and Hospital was broken. If you want to take Adams, you first have to make your way through it by taking the zone that are between Vault-Tec and Adams.
(Kind of ONS game mode in UT2004. You have to take several connected nodes before being granted access to enemy HQ)