No.  You cannot animate the Joint Parameters.

If you look inside the Poser file, you'll note that the joints are set up as standard dials  (twist or joint channels in an actor section).  They even have the staticValue, initValue, and key that you might think have some potential.  But they don't affect anything.  The values of interest there are center, startPt, endPt, angles, bulge settings, innerMatSphere, outerMatSphere, and so on.  Even though the matrix spheres show up as normal 'objects' in Poser, you might think they'd have animatable parameters - but they are only virtual unit spheres with the dial values applied to create the matrix (from which they are named) which are then applied to the joint deformation calculations.

Dynamic deformation properties would be cool, but I think it is a little beyond Poser at this point.  Maybe a consideration for them in the future for sure.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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