Hi Michael,

Thinking about it, 3D view-based rotation as you described could also be interesting to quickly adjust object rotation.

But this would be for a different usage than for making plan details.
Adjusting profiles along a sweep object of organic shapes could be a usage example.

Maybe this manner could work without the rotation angle 90º constraint or have a modifier to snap to.
The command could trigger rotate, center, and mouse "up or down" or "left and right" could approximate the rotation angle.

Thanks,

Marc