Quote: "Could we simply create a set of Antonia walk cycle poses, for use with the WD?"

I can't swear to this without checking, but I think some aspects of the way WD handles the hip are hard coded into the WD. [edit] I don't think you can tell the WD to treat the "waist" as "hip".

Also note that if you use a "walk blend" (animated walk pz2) in the Walk Designer, the output is not identical to input + BODY translation. I find that not knowing how the WD works internally, makes it very hard to construct poses for the WD. In fact the WD just plain sucks, and I hope someday someone will design a replacement for it, that gives better results and more  user control!