The problem I ran into (which is buried way back a couple of months ago on this forum) is that some combinations are either non-existant or so rare as to be essentially unavailable. Kia builds Stingers to their own combination of specs (so far, apparently) for the U.S. market. Some have been able to order custom cars and waited months, but my first order combo (GT1, AWD, DriveWise) was unavailable anywhere in the pipeline and it simply disappeared. I called the dealer after 3 weeks to check on it and they couldn't find the order. I never did get the story on what happened but a check for those specs turned up nothing, so I switched to a GT2 because I knew they were available.
So to make a longer story short, it appears that for the U.S. market, a dealer can only order what is already built and available on a ship or in port. If your spec isn't available, you have to start over. By now, there are combinations of most everything as Kia is getting feedback on what is selling and what isn't.