The Geometry COMP has a Render parameter, and I find it very useful in my scenes, and I like that it’s decoupled from the render flag. However, I also sometimes toggle the render flag on various SOPs in my scenes, and find myself wishing I could control it using expressions the way I can use expressions on the Geo Render parameter.
This is also useful for Geo instancing since you can only instance the SOPs in a Geo, and not Geos in a Geo.
Perhaps just add a Render par to the Null SOP, if not all of them?