"The presence of hidden rules..." except they are not hidden. IANAL and don't have link at hand, but there was recently a legally pretty well based argument in

"The presence of hidden rules..." except they are not hidden. IANAL and don't have link at hand, but there was recently a legally pretty well based argument in a case of a player who had an assitant able of recognizing cards from the back pattern. "you're only pushing the buttons" except they were not only pushing a button, they were also recording sequences and sending them abroad for analysis. But as you directly say that exploiting the flaws of a slot machine is not cheating and that it's fair, I guess I won't be able to persuade you otherwise.