My application does use sliders a part of a scene that can be rotated. Seems this could be a normal use case scenario? Currently used for moving slices inside a volume dataset.
The start point is incorrect, but so is probably the end point since the rotation used is probably not what it should be (guess maybe the middle point could be correct though 
) .
I do believe correctness should be important when it comes to positioning though also agree that text should be readable preferably from any rotation. Think the position issue could easily be fixed?