Bob and Rich:
Most architects just go right to the pole in the middle of the fairway at 800 feet (or 850 or 900) from the back tee, and look at the approach shot from there. I've been guilty of that myself at Sebonack ... but Jack is usually driving the vehicle.
Don't misunderstand me, Jack tries harder than anyone I've met to create multiple strategies for each shot. If anything, he tries too hard. Every hole has a strategy that only works if you can carry something 250 or 280 yards from the tee, and a couple of alternate landing areas if you can't; and then most of the longer holes have optional landing areas for the second shot defined by bunkers, too. But he still tends to look at the options for the second shot assuming you've got to Position A with your tee shot.
On other courses we've done it differently. At Riverfront in VA, I remember specifically telling Eric Iverson to look at the green sites from twenty yards left of the pole and twenty yards right, and try to make the approach shot really different from those two spots. At Pacific Dunes, we did not put in poles in the landing areas at all, because I didn't want to be too conscious of one particular landing zone in a climate where the wind had so much effect on driving distance. In hindsight I should probably do that all the time ... in fact, I've noticed when walking Bill Coore's construction sites that there is usually not a pole in the landing area, I'm always asking how far some feature is from the tee because there is no reference stake.