Render Setup Layers: Being able to instance Collections / Use Sets that automatically adds their members when part of a Collection
When you have a lot of Render Setup Layers it becomes tricky to keep track of all Collections and overrides. Being able to setup a single "RenderGeo" which can be instanced and have its changes apply to all render setup layers would improve render setup a lot.
This can either be achieved by having instanced Collections. Or having Sets include all their members when within a Collection(so you would just edit the membership of that Set instead of the collection itself).