one thing that bugs me about city rpg's is how almost no one wants to be anything other then a policeman / criminal / bounty hunter
make some jobs that can do things those classes can't do, like construction workers that can build higher, and costs less to place down plots, can sell plots, etc
also make it force re-spawn, no personal spawns, not allow bricks with collision / raycasting off, disable disappear, make it so doors CAN ACTUALLY BE BUSTED DOWN, and anything else to prevent people from just sitting in an impossible to reach location killing everyone