This one, I hope, is super-easy, but should save a lot of work.
Problem: I find it common to need to re-wire many cables coming from a single node port. In this case, I need to manually add a share, and then re-cable every single one of them. If these cables go long 'distances' on the canvas, this can be very laborious.
Suggestion: An option that appear when right-clicking on a cable that says 'Insert Share'. This simply inserts a single Share node, at the mouse position, appropriate to the cables Type (for example, list, event, value), keeping all connections.
For bonus points: Shen a cable is selected, some information is shown about it in the info panel. This would be similar to selecting a node, which shows info on this node. For a cable, this could be data type, event throttling. This panel could also expose the same right-click functionality, including 'Insert Share'.