Create Brush Sets to quickly remap right/left buttons to specific combinations of brushes

[gekitsuu]

I'd be nice to have the ability to quickly switch between sets of brushes for the right and left mouse buttons. For example, I regularly want pencil/eraser, light shade/dark shade, color picker/fill, etc. If I could create some preset combos and be able to map them to hot keys, that would speed up switching between them considerably.