Andrew:
I haven't changed my designs much to date because I am not working for people who care how Phil Mickelson will play the hole, and I'm praying to God we never get to the point where the average guy hits it like Phil.
But, when I do design a course for Tour players someday, you can expect that it will have four or five holes in the 490 to 580-yard range where players will have to hit medium- to long-iron approach shots to get home in two ... and the same holes will have tilted greens to reward the player who can hit a fade or draw when he needs to. If they call those holes par-5's then the winning score may be WAY under par, but it'll be interesting to watch, anyway.
I want to build a couple of cool short par-4's as well, but it will be difficult, because they can so easily smash driver up near the green on most holes now. What I'd really like to build is a driveable par-4 where you have to feed it into the green, because if you fly it there it'll bounce away into trouble. But, trouble like that for the Tour players will be severely penal the ohter 51 weeks of the year.