Hi Toby,
Not to my knowledge, but i wish :).
In the same way we were talking about Object handles 'Helpers' for
aligning shapes them on a map i would create some new LinkShapes
having some magnet effect when positioning.
Each LinkShape would register some shapes it is connected to (ShapeA
anchor3) and update its own size and position whenever ShapeA changes.
Hum thats just a quick 15s thought.
Greg