The Lighting Controller

This feature does not seem to be working in 6.0 version. In the 5.2 version I seemed to recall pretty much any action I did could be rectified by a push of the "cancel last mouse click" in the miscellaneous section of Builder. I see the buttons in 6.0 Editor. Is it just not an active feature yet?

Yes, this feature is not available on version 6.00.
It should be ok for next version (before spring).