I know that you can not make zbrush do everything, as it has a way to many features that one would take eons to learn, but in the same light, I see Zbrush as doing mostly static displays of models for illustrations. Most of my work is doing 3-D animation of models in Lightwave, if only Zbrush had a way to be more user friendly in putting bone rigs in models to be able to export them to a 3-D program like Lightwave to finish them out and put them in a scene. I guess I am asking too much, but then, what do I know. I am deeply happy with z-brush in what it can do, but most of the tutorials are geared for still models.
search in the zclassroom there are videos related to your issue…pose…morph:D