When I bring in a screenshot, it is not to scale, and I need to rotate it and resize to try match the pdf content. For example, sometimes I want to take an aerial screenshot and overlay it over my pdf plans. To make sure it aligns I need to scale it correctly, and rotate it correctly. It would be very handy if I could rotate by reference, and scale by reference.
Scale by Reference - if I know the road width in the screenshot is 7m, I have a reference point.
Rotate by reference - If my screenshot has two points, I can draw a straight line between them and use this as a reference to rotate the map to match my pdf plan.