Grouping for Vertex Groups, Shape Keys and Pose Library

So there is an addon for shape keys that adds something like folders to shape keys in order to group them. The developer has been asked to do something similar to that for the Vertex Groups and Pose Library but said his method does not work for those two.

I think that's a very useful feature and should be added.

Also here's the link to the shape keys plus addon: github.com/MontagueMGM/shape_keys_plus And the link to the blenderartist thread: blenderartists.org/t/shape-keys/680636/48