The joint parameters and falloff zones will typically encompass several groups. Not a lot, but some. Take a look at one of the included Poser figures for how it's done :) (Just open the Joint Editor and the joint parameters will become visible) 

This is an example of an organic figure 100% rigged with PhiBuilder :) No Setup Room was harmed in the creation of this little guy ;)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.