Always on Top/Bottom Layer

Hello Guys, i'm from Brazil, sorry for my bad english

I think to be a good idea if would have a button or property that makes the layer aways on top. Usually we work with audio layers, animatics, textures on element 3d, masks and all Guide Layer types that we keep always on top or bottom. Would be easier if exists a property that we activate and makes the layer always on top/bottom.

What do you think?