I like this idea; the problem would just be to make sure it's in a vaguely defined enough location that we can pop anybody in. Hivestems are cool as contained, realish communities where there are specific insiders, but this would be more of a casual social RP location, if I'm reading the mood right? We don't want anyone to feel like they can't have their trolls drop in.
EDIT: A virtual location might be a good idea, actually... like the GenChat here except on a troll forum. But interaction is fun too. *big shrug*
EDITEDIT: What about a realistic VR-type chat location, Second Life-style, but more solid? We know from FLARP that they have that kind of technology... we could handwave the details.