I received a notice from DxO labs that they had resolved the lens recognition problems with their software and Pentax K10D. They did say that it was not successful on all platforms, but I can say that it works fine on Windows XP SP2.
Now that I can actually use the thing, I can say that it is absolutely marvellous. It knows the flaws of the lenses and corrects for them perfectly with no user intervention other than enabling it.
I tested only a few images, but enabling the distortion correction on some 16-50 shots resulted in near perfection. Curved doorways suddenly became straight.
I then tried an image with the architectural distortion correction, and it works like a whiz. You draw lines down two in the image that should be parallel and all of a sudden they are. I ended up with a weird looking image - almost triangular with the crop, but the keystoning was gone.
I checked out the CA and PF on both the 16-50 and 50-135, and it works just like that. One image with the 50-135 that included a far hill side with evergreens against snow was night and day. With neither PF nor CA correction enabled, you could barely tell that it was a forest. Afterwards, I could see individual trees and branches.
It has been a long wait for me while they sorted out their software, but it is finally worth it.
I'll try to upload before and afters, as long as you fellow Pentaxians don't consider the subject composition.