On the one hand, it sounds pretty nice. Kind of an interesting idea.

On the other, it may be just too much for one person (David) to implement. This is more or less a hobby for him, and he certainly does good work improving the site in many ways. But this kind of thing sounds pretty tricky/time-consuming. It may be beyond the resources (of time or server space) he has. Even if he would want to do this, he might not be able to. And even if he could, it would no doubt take a long time to make it happen.

If you really want to chat with a particular individual (or small group), you can add each other as friends. Then, you can exchange information out of the public eye and set it up for chats elsewhere (or for standard-type emails, for that matter). That may not be as open and free-wheeling as a dedicated chat room, but it is perhaps the best you'll be able to get (at least for a long time).

It goes (almost) without saying, that if you try to set up off-site chats, you certainly don't want to put your e-mail addresses out on someone's user page discussion board, or on the community page or in game comments -- That's just too visible. But once you are on someone's friends list, you can communicate in private message mode, and that should be OK.

(Sorry, I don't mean to be negative on what is really a nice, and interesting idea. I just don't think it's a likely possibility, that's all.)