Presently, you can't use mm_per_unit in a scene.
You can't use it in a #declare as follow:
#declare Dimention = Something * mm_per_unit;
or in a scale statement.

It would be nice if it could be made accessible as a builtin constant 
like pi.

That could be usefull to create objects that can auto scale according to 
the scale of the scene.
The author of the scene would only need to set that value in the 
global_settings, and an imported object could scale itself, adjusting a 
fade_distance or media density accordingly.



Alain

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