As a qualified coach I'm surprised how many keepers seem to dive in hope rather than have a plan with all the time and facilities they have to study the penalty.
Lets be clear, all keepers should be on a hiding to nothing when facing a penalty but I believe the law of averages will ensure more saves if the stay and wait.
The well struck penalty in or near the corners will always score but the current way of trying to get the keeper to sell himself and then put it down the middle is a mistake waiting to happen if only the keeper was brave enough to wait.