JasperToo,
There should be no difference in the action of players with a line or without. IMO, the only difference is the line as an obvious gauge, where judgement of the dealer (or an opposing player) might raise the question of whether a bet was made, or not. As far as the release, would you require a player that is pushing chips forward and removing his hands as a release? If so, how far? When I used the betting line, players knew that a forward motion (where even one chip hit the line), committed all of the chips being pushed. Educate the players and things go real smooth, and contrary to what many say, it actually would speed up the game.
I would like to ask a question of all of the TD's, and any cardroom employees that play from time to time, when you are interested in calling a bet, do you toss your hand away and try to grab it back before the dealer mucks it? Do you grab chips with both hands and then cut out a couple for your bet?..I don't think any of us do. So why should player's get away with it? Pushing a bet forward (when it's your turn to act), or tossing your hand face down, or announcing a fold, or a call, or a raise is binding, period. In my not so humble opinion, that's how I see it.