Make sure to allow dyeing vehicles when you get to vehicle mods, it's really hard to tell who's bycicle is who's sometimes. That and I would loooove a purple bike.
I think it would be really neat to incorporate a civ style roaming bandit mechanic, where they set up camps and assault nearby players.
Everything is happy go lucky until you start getting attacked, then you know they must have moved into a nearby building, your team starts aggressively...