shift key prevents turning around

[Jaroslav]

I am used to turning around by moving mouse while right mouse button is pressed, while pressing number for the spell to be cast. Now secondary spellbar spells are casted with SHIFT key pressed, but when it is pressed, it prevents my character to turn around with mouse, instead only camera turns around and thus I cant cast the spell because I am not facing my enemy, and secondary spellbar is kinda unusable for be cause of this. I didn't find any option changing behavior of this shift+turning with right mouse button pressed, moreover I don't understand why it even changes to camera control, when one can do it with left button pressed.
It would be very nice if there was some kind of option that pressed shift won't have any effect on turning with right mouse pressed.