Paddles have a different version of the same advantage, though; my thumbs are not long enough to consistently, comfortably hit most button releases without shifting my grip on the gun. I actuate paddle releases with my trigger finger, which gives me two advantages: one, just as with your middle finger button method, I don't have to shift my grip at all to do it, and two, there's no way for me to have my finger on the trigger while reloading, because it's busy doing something else. Next time I have access to a button gun, I'll have to check out your method, though; I'm curious whether or not it would work for me. My assumption for a long time has been that if I ever wanted to own a button gun, my preference would be either ambidextrous mag release buttons or a reversible one which I would switch to the "lefty" configuration and hit with my trigger finger. YMMV, of course.