Yeah, but there's been a lot of them recently, a seperate thread would keep hes from being drowned in the mass of active games.
However, if an interest is drowned without notice, it's probably a good way to measure whether or not the players actually have the time or interest to play.
If it is going to be a new thread though, it should be called the drawing board, like it's called in the RPG referenc document, just to make it that much easier for people to know what they're dealing with.