It would be really nice if you could
1) Align and scale a canvas to existing points and feature in your document to easily align and scale it. Now you have to calibrate and then manually shift it to make it fit or align perfectly. If you could just choose a plane and two points in the drawing to scale and align it it would be great
2) Furthermore, if you could choose 3 points in your model to fit 3 points in your canvas then it could be places automatically in 3D