Do you mean when widening the eyes?
You can currently do this in version 11 by going to Face Sculpt Tools and clicking on >Eye Widening.
This will give you Left and Right sliders.
Not just widening but to do things like actually turn off one eye adjustment or the other, nothing worse than seeing the 'ghost' of an eye because it is hidden by a persons fringe so you have the choice of seeing that 'ghost' or not having any eye adjustments.
I am surprised that wasnt thought of because surely its an easy thing to implement