What the script really needs to give the user, I think, is the ability to just click in the preview window and select the hair or hairs to style.  PoserPython doesn't have any methods for mouse interaction with the 3D space, however.  Even if it had, being able to select the correct guide hair might not work out as desired.

The only workaround I can think of would be to create a box prop at the tip of each guide hair, then allow the user to select a box and work with that hair.  Actors can only be selected one-at-a-time, however, so each hair would need to be picked individually.  Depending on the resolution of the scalp prop in use, there couold be a lot of guide hairs to handle, and Poser can be slow when adding or deleting a large number of props.  So I'm not sure how well this idea would work out.

If anyone has any ideas for how hair selection in the 3D space might be able to work, I'm open to trying to implement them in the script. 

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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.