One hand on the yoke and the other doing nothing, unless you're on the Airbus just looks gash...why would you ? I mean what the f**k do you really want to use the other hand for?..admittedly it's petty pants to put it on the weekly Mea Culpa bulletin board but nevertheless......boeing recommend it. Just as your driving instructor would when you're in your car. And I'm sure competitive drivers use both hands on the wheel most of the time.....it just gives you more controllability....as Hal Dyball would have said .." What the F**k were you thinking " just do it