Note: This was originally posted by an inactive account. Content was preserved by moving under an admin account.
When I disable a node (ie set enable to False) the node greys out. Greying out the node is not totally intuitive. The text for the node isn't even greyed out. I would prefer to see, similar to Lavastrom, a black cirlce with a line through it or something similar so it is known that the node is disabled.