I suppose the word "gimmick" was a little much. After 30+ years of playing pool, I've gotten in the habit of naming everything that isn't hard-learned/earned a gimmick or slick trick. Time has changed the process of learning for pool players. It's better, but I'm still a little old school.
When I first came up with these zones for determining fractional aim points, I had a hard time putting my instinct aside in order to test the new aiming method. A shot would come up that required a quarter aim, and my instinct would whisper, "bullshit", so I'd shoot it my way instead of the method I was trying to prove, and miss the pocket by an inch. Trusting any system or new method is tough for any player with experience. My book is geared toward average players, the C player or B player that struggles with shot-making consistency.