okey LigH :]
it appears that the 0.7 exporter reads smoothed objects, directly from the blender ;p (thanx for pushing me in the right direction)
And since you are saying that CS can have separate faces within one object smoothed, while other dont, it's likely that the exporter supports that too, since in blender one can set separate faces smooth too.
I just dont have time to build a nice scene where I could spot that.