Brush Library management: multi-selection of Brush Categories

Now that I've accumulated dozes of brush packs in addition to those installed with Painter, I wish there were a more efficient way to organize groups of Brush Categories into separate libraries or visibility sets.

It would be great if we could select multiple Brush Categories at once, then:

• Create (or export) new library from selected categories
• Hide selected categories
• Apply some kind of tag to that set of categories (for use with visibility filtering by tag)
• Invert selection (as prep for one of the operations above)