I think that a couple of very simple UI improvements to the linked tunnels ability would be great.
1 - when you click create and wire linked nodes, the cursur becomes a solder iron, and annoyingly the scroll bars stop working - this is annoying if you have a large case structure. So firstly should allow scroll bars
2 - another simple tweak would be to allow a quick jump to the other side of the case structure - since this is typically wheree you are connecting.
3 - once a linked node is created, if the link is broken, then in order to rewire it you have to 'create and wire linked inputs' again - even though it knows where the node is. Would be nice to have another option - to wire to the already linked node.