Can I suggest adding some extra controls to the properties window for the three link nodes (link-in, link-out, link-call)
1:
Add a tick box to show just the currently selected link partner(s). It would be nice to filter the huge list of link nodes I have to just the ones currently selected. Some of my link-out nodes are connected to quite a few link-in nodes. The ideal location could be on the left of the search bar near the top.
2:
Add expand/collapse arrows to expand or collapse the groups of nodes, similar to the ones at the bottom of the left-hand nodes pane.
Thanks