Shielding the ball out of play is a skilful part of the game, requiring good judgement, strength and positioning. I'd be disappointed if it was outlawed.
The entire shoot-out is here
http://www.bbc.co.uk/sport/0/football/28188372
Basically, he had a little chat with the opposition penalty taker and took a while to get onto his goal line. No big deal.
All Krul did was a bit of old-fashioned psychological warfare. You've got to be prepared for that. It wasn't anything out of the ordinary or anything outside the laws of the game.
As for Robben's diving, well, that clearly is cheating.