I know what you telling me is good practice, but sometimes one do forget and before you know it, you need to go into all the sceens one by one.
What I asking is that one would have an option to drag the default node onto the screens to adjust the nodes to default again.
If I read your question correctly (and please do correct me if I am misunderstanding) is that ideally you want to be able to utilize the default node function by dragging the specific node onto the display at the same time not set every window to the node you dragged over in the IRGUI client.
Those you want to preserve and not be affected by the dragging over of your node onto the display you should set this option in those windows to protect them from the drag re-nodeing.
"Don't substitute nodes from parent document".