Addon interface ****Once the addon is installed, you'll see a very simple interface that's super easy to navigate under “Weybec” tab side panel.
Select your Shapekey object , and press Picker button in the Drivers panel, and you can see all your shapekeys there ,
https://giphy.com/gifs/blender-b3d-addon-ESQW7hTUT29X9a48a9
while working with armatures this becomes very handy as you do not need to select object again and again to check shapekeys
add any object or Bones as driver with few clicks, select your object set transformation value, adjust min and max values , and press the assign button located besides shape keys
https://giphy.com/gifs/blender-b3d-RI26hJIyb76oEUxF5W