Perhaps that restriction is similar to the need to have a figure in a scene before a pose can be applied to a prop?  Kind of suggests a similarity between pose implementation and mt5 implementation.  Maybe....

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.