Hmm, I looked at the crease in Poser, and I can't see anything wrong with the joint setup. This seems to be a genuine case where the mesh can't quite handle the amount of deformation. A JCM should fix it.

By the way: I'm using DAZ Studio 2.3.3.146, which seems to handle pmd files without any problems. I can load my pmd-enabled cr2, and the JCMs work like a charm. So it seems like that thing about D|S not doing binary morphs is old news. Or am I missing something?

-- I'm not mad at you, just Westphalian.