Feature request: Make unique an instiantialized layer.

Basically I can not manipulate instantialized layer beyond adding a mask to it.

Ok, fine, so let's give up and make non-instantialized copy of it.

In order to do it now, I need to go back to master material, copy layer(s), go back to my working texture set and paste.

It should be 2 clicks - right click on instanstialized layer, "Make unique".