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Having seen in the Generic Male rig (https://www.characteroutsource.com/) that the author had shared a shape node with custom attributes through the rig I set out to work out how it was done.
The technique is quite simple and utilises an instance of a curves shape node with custom attributes applied at the shape level.
This script simplifies the task as it allows you to select the shape node and propagate it to multiple objects and also to remove the node when not wanted. Sharing the shape node can not be done directly in the interface as it requires flags only available in a mel script.
Hope it helps any questions or requests please ask.
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