Just on the semantic thing. I obviously agree that a release is only a pure back tension release if it doesn't have a trigger lever, etc... On the other hand when you shoot/release with backtension you are triggering basicaly all these releases the same way, you are changing the angles of the body to the release. The stan feels purer, because by the time you get one in your hand, if you are like most of us you have pulled thousands of triggers, you understand what that feels like, with the stan it isn't as clear at first, so you really get a surprise. But you can still "punch" a stan, by tipping your wrist, and you can set up on a thumb release with your thumb blocked against your index finger so that you would have to move stuff before you could punch the shot. A stan can also be set up with too much sear so that there isn't any way it will go off with BT, and you have to crank it. It is always a subtle thing, and in some ways even more interesting than the fingers release. What I have noticed in training people is that they won't really get what they are supposed to be doing with BT until they get a stan (and simmilar) in their hands, after that they really learn that BT isn't just something you do while smootly pulling the trigger.

On the mouth punching thing, just practice with some cord instead of a bow, at first, and you will get the sense of how to fire the thing off without endangering your teeth. When you draw back, your teeth should never be in line with your release anyway. If you can't draw the bow without endangering your face, it's too heavy for you.