Armature Preserve Volume restriction to Vertex Groups

I really love how does the Preserve Volume function of and Armature Modifier work... Sometimes. And in some other cases I really hate it. And it is OK because it is just the automatic solution. So, the most logic way of automatic volume preservation is to grant the ability for user to paint manually the weight of the zones need to be preserved in volume. Yet another "Vertex Group" option, just like it is done for many and many other Blender modifiers. e.g. Maya has the same approach.