Dieter,
the Extremely Dense setting should not be necessary. With programs like Instant Scenery you can set what density setting needs to be used to view an object you add to scenery with IS. I would be concerned about anybody who would use Extremely Dense settings as most people would never be able to enjoy their scenery. One notch back should give you everything there is to see and prevent what you found with Thorne Bay Lodge.
I have noticed that with the new version when you go to PF08 in the Airport selection section of FSX the starting point is off the runway a few yards and no where near the approach end of either runway. Could this be tweaked?