Sliders to transform rigs?

Hey guys,
Is there a possibility to make a rig where certain elements are linked to a slider? E.g. if the mouth line is done by a curve deformer the very right position of the slider could be a frown, the very left could be a wide smile and other positions of the slider would interpolate between the two. It would also be very helpful for a head turn or stuff like that.
Any ideas?

Not presently no.