Lock the Top Layer, just like the Background Layer

The Background Layer (name in Italics) has a special status: it's always the lower most layer. Can't be place anywhere else in the hierarchy.
What I would like, is a special Layer that's always on top. I'd use this for a general Adjustment layer, a texture, vignette or anything else that should affect anything beneath. When this specific layer could be defined as 'Top Layer', it's no longer possible to (accidentally) place something above it.