Hello, I'm working on a face rig that includes an auto-rigging component designed specifically for creating corrective blendshapes. With this feature, you can select the joint you want to trigger the blendshape and adjust the strength of the blendshape using a ramp. Additionally, you have the option to combine the values of multiple joints, allowing the blendshape to activate only under specific conditions—for example, when two or more joints move, or when a single joint moves in two or more directions (e.g., the smile blendshape activates when the joint moves both left and up).

I've also developed a similar auto-rigging component for rotational values, though it's not particularly useful for this rig.

Cleaned the tool and added a mirror feature

Finished Rig