Tommaso Sanguigni (remember the Formula Deformer for Maya?) shares a tool used in his personal toolset for Maya called tsFrameBlendshape tool which allows you to easily create, connect, and animate animation based corrective blendshapes in Maya. Check out Tommaso Sanguigni’s post on the tsFrameBlendshape tool for maya here.
Tommaso Sanguigni notes: “This tool is part of my personal toolset. It let’s you easily create, connect and animate animation based corrective blendshapes. Just go to the frame you want to correct/deform, hit “Sculpt” and edit the shape of your mesh. The cool thing is that the script works on pose: you can sculpt the corrective shape in any pose, then the script will bring back your deformed mesh in base pose automatically to create your corrective shape. Coded in python.”