Igrenier: I fear changing the pin locations on existing courses would be a marginal improvement, if desirable.
You're kidding? Alright, we should cut you some slack because you didn't even know pin locations change in real life... But rest assured that a changed pin location can completely change the difficulty level of a hole. I guarantee you if WGT make pin locations variable on Kiawah & Bethpage, it will feel like playing 2 brand-new courses! That's why I believe WGT should first make pin locations variable on the current 2 courses before moving on to creating brand-new courses.
There are some holes in this game, like Bethpage 17, that are much harder to play than they should, based on their handicap ranking. I think hole 17 right now is pretty difficult because of the pin location. If you move the pin to the left or center, it's a whole new green to play with, because that frontside bunker would no longer come into play. Also, changing the pin location on Bethpage, hole 15, might dramatically change the strategy required to play that hole.