I have not been able to find if anyone else has this need. I’m also not sure if this is a bug or a future request 
I will ask the question, so whatever happens to me
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I have noticed this as well. There, perhaps, is nothing in the code that takes this Uniform Scale checkbox into account when connecting that scale driver node. Thanks for the screenshots and labeling you did!! It helped me out.
In the end I solved it with a postscript, although I wouldn’t complain if that process was automated during rig creation
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Hello,
I recently encountered this issue, and eventually found a setting on the guide root that force uniform scale on all joints.
Turning this option off will let us set the uniform scale on individual components.
Thanks,
Paul
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Exactly, thi is not a bug, but an option 