the position you describe is generally known as thumb up, and has been used for decades to get an inline squeeze on the trigger, rather than a twist. Many (aftermarket/hi end) stocks have cutouts to facilitate a compy thumb up position, especially thumbholes, ironically. The amount of contact with the palm of the hand is normally a little more than the zero you describe, but it's very low forces involved.
Here's an example:
and a factory stock with a thumb up poistion groove:
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.