This is a useful DAG utility which Diogo and myself cooked up...
"Bookmarker" bookmarks any node including backdrops, so that you can then find these easily and quickly through a drop down list or cycle through them. You can bookmark as much as you like.

To bookmark a node, select it and select 'add bookmark' - enter a description.
To find bookmarks select 'find bookmarks', and select it from a drop down list of all current bookmarks, set zoom value and the DAG is centered on that node.
Alternatively use 'cycle bookmarks' to cycle through each one.

A menu.py is included which has my default shortcuts in it.

enjoy
Howard and Diogo