Yes... the thing with the rotation tool is this:
When you click once the item is rotated by 15°. I decided to not go with 1°, because then you had to click for a looong time for a full totation and if you rotate it one step too far this gets really annoying. Another reason is it is very difficult to see if you made a 90/180 ° rotation if the steps are so small. 15° felt like a good middleground.
I don't think I will change the rotation tool, but I could change the position of the shield so it fits the 15 ° steps.