How many times you type 90 or 180 degrees in the rotation box?
It would be so easy to make use even of the Angle of rotation arrow next to the rotation value box and make it do something instead of just showing an icon.
Just click and it rotates 90 degrees as default for example (if you don't want to put any extra icons).
This is the perfect macro for you!!
GDG Quick Rotate by John for X5 and below
you can hold Ctrl key and rotate manually
I like the idea Milosh, and will pass it on to the developers.This doesn't mean that it will be a new feature but it sure is worth taking into consideration.
How about click to rotate counterclockwise and Ctrl+click to rotate clockwise?