custom multi-attribute paint tool

I have recently made this tool which automaticly finds multi-array attributes on objects (paintable only) and adds a custom part under Maya paint attribute UI. I have a multi-target custom blendShape which I can paint with this tool now. It`s scripted with python apart from user defined context commands which had to be MEL (wrappers to python).

paintMultiArray tool demo from Jakub Krompolc on Vimeo.