Tuned on Auburn plugins. This brings a sense of dynamic range, possibly lower would be a bit better. 0.3f wins over 0.5f and 1.0f.
Normally not much reason to change this. This is the threshold above which colors are allowed to "bleed" into others in a gray way.
Override this to allocate temporary buffers, eventually.
Override this to specify what the pass does. If you need more buffers, use type-punning based on a CompositorPassBuffers extension.