Big Cat Lover said:So it doesn't matter that the bowler knows he has not legitimately dismissed the batsman when he knows it has been edged onto his pad because it is in the course of play?
Falls under the umbrella of "gamesmanship" and is more or less an accepted part of the sport. In any case, the umpire should be able to see at least as much as the bowler.
Some of these things are necessarily subjective, e.g. personally I believe "walking" is for fools.