Bang when itable edited with mouse (at beginning and end of editing).

I am trying to find a way to create a bang or a 1 at the moment I begin editing an itable with a mouse. The bang that occurs after an itable is edited is great but I need one at the beginning as well(only from a mouse, messages sent into the itable from other objects do not need a bang). This is to facilitate an automatic save into pattrsotrage whenever I change an itable. Any ideas? Thanks.