Do we have a facility for such a thing? If not, do we want to start one?

If you are serious about getting your PbP on, I moderate a site that has the entirety of the 40k RPGs in one form or another running at the moment. We are rather small, but we commit to daily updates and everyone is having a really good time.

Along with 40k PbPs, there is a Star Wars Sage game going, as well as a Pathfinder game and a Vampire the Masquerade playtest.

Send me a Private message if that sounds like something you would be interested in.

I was going to say this might go under the fanfiction section, but Pearldrum1 seems to have a more appropriate setup.

I think having Play-By-Post on the official forums probably wouldn't be a bad thing. It might encourage more activity than we currently see. The only concern I could see happening is people reading their GMs' threads asking for advice and revealing their evil secretses. =P