I was playing around trying to get the topic to work.I tryed to set "Specified Selection Sets" to the same selection set.The logic there is only things against each other in that set.(did not work)
Seems that this would be valuable.It would save time creating these rules against the numerous different clashes.Example ignore hangers(this would be a search set of all hangers in all files).Then
you would only have to pick this instead of setting each trade against hangers.