Wouldn't it be great, if we could "isolate select" the visibility at the display layers?
These display layers do already store a selection, so why not expand the funcionality.
At the moment we can switch on and off, but it would be even much more versatile if it could isolate the associated layers. And very easy to implement...
It could be with a 4th button or with a middle mouse button click.
(Similar to the vray "light lister" where you can isolate a light with a right click)