I think there may be some misunderstanding on how composition effects work.Sure, I can use an Effect Layer and control whatever is beneath that layer, but in my view I think it is best to have composition effects where they belong.
In my view it would make sense to have a mappable button on a layer so I can toggle global effects on that specific layer.
Composition effects work as follows: combine the pixels of layer 1, 2, 3, 4 and 5 together, then apply the effect *once*, on that combined result.
They do *not* work as follows: apply the effect on layer 1, apply the effect on layer 2, apply the effect on layer 3, apply the effect on layer 4, apply the effect on layer 5, and combine the result of those pixels. In fact, that's what layer effects do.
There is a fundamental difference between those two ways. The difference is that the composition doesn't "know" about its layers. The composition is just a *single image*, combined of all the pixels that are in it. Effects applied on the composition are applied on that single image. The moment you're applying an effect on the layer images directly, it is per definition no longer a composition effect. The only way to exclude a layer from the composition image and therefor the composition effects, is to exclude that layer from the composition entirely.
It looks like you are actually requesting to apply an effect on every layer except one. It's very simple to do that, you simply apply an effect on every layer except one
