individual translucent object

I'm not sure if this was put here before but one thing that would be nice to see. Would be the ability to make background/unselected object translucent (see threw) and the forward object opaque.

When working on retopology I often use a reference for ether human/animal topology and sometimes the base mesh gets in the way so I have to hide it then unhide it a lot. There is

Sorta of how zbrush does.