Yes, yes, yes and sure thing. The eye controls on LaFemme 2 control both eyes. The face controls include rotation, scale and translation. It's just a question of how many dependencies you're willing to wire up. The only "no" is that no, a prop can't have multiple parents.

If you look at LaFemme2's eye controller you'll see how it moves both eyes. It's attached to it's own ghost bone that drives the dependencies in both eyes.

Look at the controls for the Metacarpals for an example of how ghost bones can control real joints.