once you've imported the OBJ to UVMapper and done your map, try Edit->Tools->Split Vertices I'm no expert on UVMapping but if you split the vertices before you save the OBJ back out, should be in better shape when you import to Poser - it'll still be smoothed, but not as much (try the other options there as well - Fix Seams and Weld Vertices) for what it's worth, I'm yet to get a model out of max and into Poser as an OBJ in absolute perfect condition