But unfortunately, Poser uses the term "smoothing" in the render settings panel to refer to subdivision.  Vertices actually are added at rendertime, so a sphere's edges will appear much more round with smoothing on than off.  It's something that's easy to overlook as you never see the added detail in wireframe.

Crease angle was a godesend when I was doing low poly "mecha" in Caligari on the Amiga.  I could set each individual piece's smoothing threshold.  The end result being that I could achieve apparently smooth pieces with low poly counts, and still have a few hard edges so as to avoid the "pillow effect".  (I think that's actually the correct term, BTW)