I always had dreams of implementing the sequential turn type on PBW. It isn't really neccesary really, since there would be no processing on the server. The only advantage having it on PBW would be in a game with several players you could keep track of who currently has the turn file. And the server could send out reminder emails to keep things moving along. My idea was then PBW could support SE3. Although by now I don't think anyone plays that anymore.
