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it seem that is not possible to set a dimension between two points. I'd like to help you in develop NaroCad. How can I do ?
We have a function named PointsDimensionFunction that draws dimensions between two points. It is used on various animations to show length. It is not yet "published" on GUI as a dimension tool.
We can discuss about contributing at Naro, please contact me at mihaizn(@)gmail(dot)com to discuss this further.