Add ARKit: Adds the 52 ARKit blendshapes and 18 "unmirrored" extra blendshapes, meant to be worked on with symmetry to later be split into their Right / Left parts.
Driver Link: Add a driver setup to the secondary meshes.
Select: Select the driver and driven meshes.
Mirror: Click the mirror button to split an "unmirrored" shape into its Left and Right blendshapes.
Set Active: Set a blendshape as active on multiple meshes.
Folders: Predefined folders for the ARKit shapes and an Other folder for your custom ones.