I never seem to "leave" the chatroom.
When I've been off my Mac all day and open my PC browser it automatically starts the pinging noise at the bottom of my screen with the red notification and when I click the drop down "Who's in NEW chat" I'm just in there (and have to assume I'm not there when I'm not logged onto PC).
Majors and minors, this is not a big issue to me and I'm enjoying the new chat a lot - but just thought I'd put it out there.
Ah well, first world problems I guess