Brian, good post. I have been following this closely.
I check for this bracket on every inspection. What I find is 1 out of 10 actually have the bracket installed. 3 out of 10 have the bracket in the wrapper, usually in a nearby drawer.
I supply the buyers with this photo and PDF link to drive the point home.
http://www.consumerfed.org/pdfs/Stov...ease040507.pdf
To all new inspectors: You should be checking for this. Open the range door and exert some light pressure on the open door and the front lip of the range. If it tips forward without stopping after about 1/2" of lift, write it up.