Bukkit

What is the enhancement in mind? How should it look and feel?
Zombies cant spawn in a certain region. If someone wants to build a big camp (like a dome with world edit) they wouldn't want zombies to spawn in it so maybe make it so that you can select an area with a wand or with world edit and have a command, like /apocalyptic set spawn (true:false) and then zombies wont spawn there. Or stand in a certain point and do /apocalyptic set spawn (true:false) (radios) so they can do /apocalyptic set spawn false 50 and that way no zombies will spawn within a 50 meter radios.
Please provide any additional information below.