Feature: Setting a relative angle and px distance for Jaw handles

It would be useful to be able to associate an angle for the deformation of jaw handles. This angle would be relative to Head Tilt, so it would add a clockwise or anti-clockwise vector to the existing -180º vector of Jaw movement. Add the Manual Jaw Adjustment available to visemes to these handles, and we'd have a useful and robust new tool for managing facial expressions.

Use cases:
• Cheek deformation (in or out) for sounds like "Ee" and "Woo."

• Actions like chewing, whistling, holding breath, smiling widely.
• A wider range of possible jaw movements for highly stylized faces or profile faces.
• Micromovents of ears, nose, etc. to give a face more dynamic aspect.

Some of these effects can be achieved with current rigging, but the effects are not always predictable and sometimes a Cycle Layers is required to achieve the desired effect even though the look desired is really just a deformation of existing geometry.

I think this feature would be particularly useful for Parallax rigs.