The Sages of Despair is a roleplay social group. The thread you are referring to is a collaboration between me and the original creator of said group for a set of crossroad exclusive RP's, involving BA characters rather than the members of the group. The majority of the group members at the time we started the crossroads edition were not into "serious" RP as we used the *action* followed by dialogue format. You could think of it as a parallel universe story to the main group.
In any case, this has existed for a while now, and it is allowed. I had originally put forth a request to the BA council through Shrub for a sub-forum, which was turned down as expected, and Shrub suggested I simply make a thread for it, and keep track of our own stuff within the thread, and use it for chat of the RP members. We don't want for it to be a big thing, just small group of anyone interested in group RP.
What's with the "Sages of Despair; Crossroads Edition"? I'm not say it's not allowed (I didn't read through it, and it's probably allowed anyway), but it's not like the "Sages of Despair" consist of many BAers. :/
Just so you know, if you looked at any of my (non-VM) posts and held your mouse over my name, you'd be able to see every name I've ever used here except the first two and I believe five specific other ones. (But it'd be more fun if you tried to guess before looking it up. )