Training Goal Keepers

One of the areas i think, that is still really under under developed is the training of goal keepers. I like the way when you talk about above, what your saying is that let's take the game as the bait and find ways of creating stretch in it. How can they train above the game? Like one thing i've experimented, and by no means have i got this nailed on right, but where you do have, for example, we often a game which would be cross pitch. Now there's a little bit of danger, i will admit, so i'm not a hundred % comfortable with it. But its quite interesting because it's quite overloading, and it is difficult