+1 big time
Crew bases / headquarters…at least two in each city, but they can be robbed, or even completely taken over by rival crews.
Have a claiming system in place so that a rival crew is able to come take over the headquarters by occupying the area for set period of time… like 5+ minutes.
Fortified fences and gates that can be hacked or destroyed.
Would definitely incentivize official crews and crew formation.. lead to more interesting battles for turf.