No problem with the feint/stutter, it's just like giving the keeper the eyes, body shape etc to sell him.
Beardsley has practically an entire YouTube showreel of feinting keepers and making them look like idiots.
I seem to remember John Aldridge being one of the first to do the deliberate 'stop' in his run up, just before he took the kick.
Not sure if he started doing that after that miss/save in the cup final.
He was definitely doing it before then. It started late 70s as i recall but can't remember the first. I do remember it being on On the Ball though, which was ITVs version of Football Focus. I also know that Platini, Boniek and Hugo Sanchez did it regularly.