The ghost would be able to "possess" somebody's prop, which would be funny as heck. Give it a cooldown though, just like the disguise swep.
Paranormal investigator uses a lame ghostbusters photon pack thing and absorbs the ghost out of the prop to then KOS it. Ghosts can KOS paranormal investigators using possess, which also lets them overwhelm a player's mind if used enough.
I've been wanting this job for a while now, but I thought I'd make it more official (again).
Just a simple KOS to KOS faction and the ghost spends their time haunting house props of innocent players while the investigators can spend their time hunting them down using some detecting tool (EMF or something).
PRETTY PRETTY PLEASE?