You can (apparently) disable nodes which are in a group:
Edit - Though I don't know how to get the "Action List". For me CTRL SHIFT p when I'm in NR editor opens a new browser window.
I changed the keyboard shortcut. My word, what a long List it is, and in a small not resizeable popup too!
I see that some Actions in the List have keyboard shortcuts. Is it possible to assign a shortcut to En/Disable Selected Nodes?