Last time I had to edit smoothscaling into a cr2, I seem to recall some slight inconsistencies.  I used Pro12, in which I was able to add smoothscales in most cases using the tools provided in the Joint Editor.  However, in cases where the smoothscale references were not present in the actor itself or its parent, the Joint Editor didn't work and I had to edit the cr2 to create those listings.

The best way to learn how to create the smoothScale references by editing a cr2 may be to examine actors which already have them, in your cr2.  The smoothScales are like the other joint and twist listings, in that corresponding references to the same parameter need to be in the actor itself and its affected actor.  Traditionally the affected actor would be the parent, but in recent versions any actor can affect any number of other actors.

I don't know if smoothScale handling in the Joint Editor may have been improved in Poser 10/Pro14.  If you have one of those versions, that may be worth trying first, before attempting to edit listings into a cr2 by hand.

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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.