Comment 2 for bug 171494

I'd love to see that too!
I have an additional suggestion for the "scale of choice" feature:
One could introduce special shapes (or use the existing ones) to which one can assign (x- and y)-scales. All dimensioning object placed into such a shape (i.e a box) would use the specific scale of that shape.

This way it would be possible to have multiple maps with different scales in the same document.