Funny, I wondered if anyone did this, because I naturally use very little of my index finger even though I shoot split, and a while back I experimented with simply dropping the top finger after reaching anchor. I broke my drawing hand very badly many years ago, and at that time had no insurance so I never got it properly fixed, which would have involved surgery and pins or a plate to reposition the bones. Looks like a camel's double hump on the top of my hand, an exaggerated version of the classic boxer's fracture. It shortened my hand some, and the fingers don't all straighten out like they used to do. As a result, almost all the string pressure is on the bottom two fingers, though I do use the index finger to draw. Dropping the top finger did seem to give me a good, quiet release, but it seemed to break the flow of the shot for me when I curled it behind the string to get it out of the way at anchor. I never really played with trying to draw with only two fingers, though. I guess people have played with just about every possible way to shoot these bows just a bit better, and if it works for you, that's about all that matters.