I imagine you are talking about using backtension to release your shot. Technically, you should be setting the release off by steadily sqeezing your shoulderblades together, not by pulling straight back at the elbow.
Can it be done this way? Yes, but with any release that has a trigger, whether it be a wrist strap(index finger) or a hand held(thumb release) you have to sooner or later exert some pressure on the trigger mechanism. It can be done subconsiously by using backtension.
With any release, you will shoot better when you are consistantly surprised by the release.
Poking at the trigger just won`t yield tight groups unless you are one lucky guy.