There have been some enhancements in this feature. See the updated Tutorial: https://youtu.be/Ly64vezt0Go/t=380
This video explains the Manual Vertex Alignment enhancement to the assign shape keys add-on. I hope this will make the add-on more fun to use :)
Add-on Download: This tool is now part of the Blender add-ons repository, so you will see it in Edit-Preferences-Add-ons (Blender ver 2.8 or later). No need to download it separately.
Documentation:
https://docs.blender.org/manual/en/de...
https://github.com/Shriinivas/assigns...
Intro Video: • Free Blender 2.8 Add-on to Assign Bez...
Other add-ons and extensions
• Add-ons & Extensions