What about llSetKeyframedMotion, which the wiki states:
llSetKeyframedMotion is implemented in terms of frames and not real time. To avoid a drift from the expected positions and rotations, use times which are integer multiples of 1/45, e.g. 20.0/45.0, 40.0/45.0, 90.0/45.0, etc.
Region Idling coming to Second Life
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What about llSetKeyframedMotion, which the wiki states:
with a link to the forum?