When a pass comes true, provide an option to add the recording to collection. This seems like a natural way to work when one has a pass for a show and no recordings as it avoids the required hunting for recordings when using collections to view our recordings. This would make collections much more valuable.
Well, Library Collections can have content added to them automatically if they fit into any of the rules. The gap you are having is that your new pass does not fit a rule, which is a situation I and others also share. Implementing the solution below might work better for all of us:
That's a similar issue and if the label existed, you are correct it could be used to add to the collection. Why have the complexity when the pass could directly add to the collection? I support both features.