Enhancement Request: Link In/Out Properties - Filter Connected Nodes

Within the properties pane of the Link In and Link Out nodes there is a filter box to search for existing nodes to select. Can we get a tick box (or other option) to filter only selected items.

I use link nodes quite a lot and it would be nice to be able to see just the nodes that are linked to the one I have selected.

Something like this very badly mocked up screenshot...

LinkOutNode