I loved SC2. In that game when you dragged a structure it would duplicate it in the direction you moved your mouse. Then the unit would just build all the structures one by one. I would love to see this feature added to the game as soon as possible because it would make creating a base allot cleaner and faster if you could drag and duplicate a structure in a line.
Currently, click and drag rotates the building. So your suggestion is lacking, a full suggestion would cover how to rotate buildings now that click and drag creates a row of buildings.
What if you want to shift queue a bunch of structures a change the orientation of each? Releasing shift to rotate sounds unwieldy.