Being able to exclude a layer using overlay mode blend

the new overlaymode is really nice, just thought it would nice to be able to say what layers to use (exclude the ones you dont want).
i know you can always hide the layers, the problem is somethings you want to see the layer below without overlaymode effected by it.

I dont use smudge a lot but being able to exclude layers from certain operations would be really good. something like the draft layer in CSP. Something like an option you can mark the layer to exclude it from operations in general. Another way to see this would be making a layer “protected”/“isolated” so it would only take operations done when its the current layer, of course this should be a quick thing to toogle imo, something like a new icon in the layer docker.