As you know the Space Bar will rotate components when you have one or more selected. This proves quite handy, further if an element is held above an angled element the Space Bar action will pick up on the angle and align the rotating element with this angled reference.
A collateral effect of the use of the Space Bar is that the temporary dimensions relocate themselves according to different references as the element rotates.This can be used to good effect on cylindrical elements like pipe fittings or sprinklers as well as circular or similar annotation that doesn't really matter when they are "spun". For these particular situations pressing the Space Bar results in the flipping of temporary dimensions to other elements. A temporary dimension that was referencing a wall on the right will now reference a wall on the left.
Usually this result is stumbled on and easily forgotten so I thought I'd mention it again.