[Lostangel]

To help prevent stalking of one player by another, maybe Z can add travel time to the game, so that you can't immediately go from zone to zone.
Having majored in Cartography (Map making) with emphasis in Urban Planning, I usually think about stuff like this.
There are three ways I though about how this would work.
1) If I was designing the game, each zone would have a location, and travel time between zones would depend on the zone you are in and the zone you are going to. For example, Midlands might be close to Rural, meaning a 2 minute trip, but farther away from Industrial, which might be a 5 minute trip. Downtown might be 3 minutes from Industrial, 2 minutes from Midlands and 6 minutes from Rural.
2) You could have a flat travel time between zones
3) You can have zone travel times be based on minimum level to enter zone, so Midlands takes longer than Rural.