Sorry to take so long to reply to this but slerpy can do what you want fairly easily.  See:
See the smorph command.

>>> "Demirci, Hasan" <> 4/4/2007 10:27:09 AM >>>
Hi everyone,
Does anyone have a modified version of morphing script? The one on the rigimol manual only morphs the structure I want to show the morphing while I give a glorious 360 rotation of my structure.

Hasan Demirci
Department of Molecular Biology, Cellular Biology & Biochemistry
Brown University
69 Brown Street
Providence, RI    02912

(401) 863-3652 lab
(401) 226-7852 cell

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