Reverse guide layer
Can we have a function that would work opposite to Guide Layer?
What I mean, I'd like to mark a layer to render ONLY during final render, NOT while I'm working inside AE.
I constantly forget to enable Add Grain before the final render, especially when in the heat of the batlle when we're pushing out 10 revisions of the same shot while the client is already waiting. I disable the adjustment layer with Add Grain to work faster in AE and then I forget to enable it back again when I hit render. It's especially difficult if you have revisions to a couple of shots in your project - you're bound to forget the grain at least on one of them.
So it would be nice to just set the Grain Layer to "reverse Guide layer" and just forget about it - it would not slow down performance in AE but it would always render with the final rendering :)

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Paul Roper commented
I requested this exact idea many years ago! Maybe it could be called 'render-only layer'.