Sounds like a good idea. WHat we could do is have ppl who play said game quite often be appointed as the "party leader" and have everyone that is interested playing together come to a consensus on timing and then post the verdict.
For example: As you can tell from my sig I have played a lot of Halo3 so if I became party leader than we can make a new thread and have each of the other party leaders make an individual post about their game. I guess we could think of it as a mini hub. There may be a simpler way but the idea of the coop and achievement boosting is great!











