It’s official now. Oskar announced it for Falcon… see the official post here: Keyframing now available on ADITI.
The function name is confusing. Falcon posted late Monday that he was thinking of changing the function name to: llSetKeyframedMotion, which would probably be a good idea.
If you follow the blog you’ve already read about this function, so I won’t rehash it here.
If not, check out the llSetKeyFramedAnimation related articles.