prune conversation & invisible mode questions

Is it possible to make conversation disappear for those who leave the room? For example, set an option that gets rid of conversation if a person leaves a room and comes back.

Also, if a person is in invisible mode on the boards, are they then invisible in chat as well?

Thanks!

[Zero Tolerance]

Delete messages when someone leaves? Kinda irregular, and would be a pain if people are still talking in that chat room.

"Stealth Mode" may be something that is coming in a future release

- Zero Tolerance