Basically what I was looking for, was a zone that, when entered by players removed/changed friendly fire protections for the duration of their stay in them.
Basically, I was making a HUB map for my upcoming Monsterhunt server, and wanted to have an arena area where people could fight each other without disturbing the peace outside the arena!
I can probably think of other ways to do this too, running the HUB map on a deathmatch gametype springs to mind (Weapons are already removed upon level entry) but that would make it not show up on the MH server list. Would a zone like this be possible/easy to do? I don't want to ask for anything too outlandish or freakishly difficult!