Like Maxwell, I hold the manual battery differently all the time. Right now it's thumb/button, 3 fingers on top, and pinky extended. Sometimes 4 fingers on top. I get crazy sometimes and even do index/button with all other fingers in the air. Reckless, I know. For a subtle giving of the finger, I use the middle finger/button, and curl up the others, and smile of course.
Southpaw vaper.