I don't believe there is any way to manually control which shift map is being used, nor is there any way to tell which one of them is being used.
If I remember the Panorama article, it was an interview with a Porsche/US test driver and driving instructor. He explained an undocumented procedure for causing the Tip to skip gears during a downshift sequence. In other words to jump from 5th directly to 3rd, instead of going 5-4-3.
Basically, you jam on the brakes before the corner and SHARPLY jab the accelerator to the floorboard and release. I have tried it, and sure enough, it will jump down to whatever gear is appropriate, as determined by the computer.
Outside of racing or auto-x, I can't think of any really good reason to do this, or to do it enough to get good at it, but it does work.
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