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I need to scale the measurement unit in order to make the virtual constructions correspond to actual constructions at a specific scale.
This is a simulation of what I mean, except that it is only necessary (and useful) to set a scale value once, not use the wheel in real time.
I like this idea 
hello
have you tried zoomin[]?
or perhaps a buttom with a script :
zoomin[0.5,A]
dilate[<circle>,2,A]
saludos
My constructions are very complicated, the circle is just an example, it wouldn't be practical to use a script for all the components.
On the other hand, from a programmer's point of view it must be trivial, like adding a single variable to scale the measurement unit.
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