This is something that has been lingering for a while.
The shell 'zoning' idea (to foster shells being of a certain type: residential/industrial/communal/commercial) has always been a bit confusing for many people, and doesn't prove to be very useful in the end.
As I look at the map of the city and the shells released so far I realize we might just do without this whole zoning idea. While it is a nice idea in theory, it doesn't seem to really catch on, and it doesn't seem really worth enforcing either at this point.
Robert, Dox, (or any one else interested) : would you agree to official get rid of this system? -- I would update the map and the wikis accordingly.