There is a legal way to shoot this shot by laying your cue on the table and holding the ferrule between your thumb and forefinger. You can then shoot by moving the cue forward with just your two fingers. You'll be surprised at how easy it is to shoot (and control) a little tap shot (safety) this way.
That was tried at a Mizerak tournament in Biloxi....disallowed
I believe a bunch of tournaments disallowed laying your cue on the table.