I don't have Zbrush. I do have Poser7, and do my displacement and morph stuff in Silo.
I find that (Poser gurus, correct me if I'm wrong) the morph brush in Poser7 is more suitable for small tweaks in poking, bulgin, and etc in clothing, and rough morphing of characters than a dedicated complete morph tool that would replace Zbrush (or Silo or Hexagon or Mudbox, or any other software that can do displacements and such).
Maybe I haven't dwelled enough with the Poser7 tool, but I find working faster for character morphs outside Poser.
However,
in the case of conforming clothing, which in some poses do strange things, it is a pain to export the mesh of the body parts and the clothes and somewhere else do a morph, and export the clothing mesh and then apply that as a morph target. In this regard, the morph tool in Poser7 in a gift from heaven.

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