Scott, thanks for the links.  I don't know why I didn't think of 
quaternions.  (Well, maybe because I've never used them!)

Given the rotation axis (the sum of pseudo-torque vectors), the problem 
remains of determining what angle to turn about that axis.  Maybe I'll 
simply use a small constant angle -- resulting in the animation that I 
keep saying I don't want to make!

... Hm, I can start with an arbitrary step-angle of 1 radian, say, and 
reduce it after each round by the fraction of the population for which 
the torque-vector has a negative dot product with its predecessor ...

-- 
*\\* Anton Sherwood *\\* www.bendwavy.org

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