I think it'd be nice to have a sub-board for 1x1 rps, meaning rps between just two people.
This way, they can have a forum to pretty up and keep track of everything much easier, and there can also been a thread there to Search for 1x1 RPs - you would post things about your RP style and such, and things you'd like to have from a 1x1 partner, as well as types of rps you'd like to do.
I got this idea from ChickenSmoothie, which has this in place ^^