A new take on safezones

First of all, if this is possible already in other plugins please tell me and i will use them instead.
Suggested name: Safezonextra
Suggested category: Admin / Util
Timeframe: Soon as possible
Request: To have a plugin where i can use worldedit region selections to define a particular safezone (if this doesnt work, chunks are fine) and in that safezone, things are a bit different to normal safezones.
1) The player can hurt and be hurt by CITIZENS npc's.
2) Players cannot hurt eachother
3) Players can be hurt and killed by mobs.
4) Explosions and such will not hurt players inside the safezone

Thanks!

 

ill try it (never used wg before)

 

there are tons of tutorials out there.

 

timtower loads of big plugins are saying "since the death of bukkit" and such, what are they talking about?