Just as teleporters come in different colors so as to make it clear which porter is connected to which destination, it would be very helpful if breadcrumbs came in multiple colors or with a choice of symbols emblazoned on them, so that visually one could see all of the paths at a glance.
It would also be a great help if all castle magic objects could be renamed to uniquely identify them in the house, but I imagine that would be a potentially difficult undertaking without some extensive changes to the basic functionality of the castle magic. (Though, bread crumbs already identify themselves to each other using numeric ID's, as seen in the pathing node user interface.)
