So, there's a very ugly workaround (load obj., morph, re-split via script) but they can't get it to work inside Poser?  It reminds me of a post in another forum where a blenderdefender told me that swapping blender's Y and Z axes to be like most other programs would require too much recoding of blender.  (Hmmm...  change "y" to "z" in GUI, check if object is native blender or import and reorient if necessary? Maybe change a hot key or something?)  I'm sure if it were more important to them they could find a way to do it.  I noticed a few people's answers in the survey (as discussed here) were quite different that mine.  I'm sure if "make morph tool work across seams" was one of those 1-to-5 questions it would get a few high rankings.