Happy to report, it works fine. Here is a very interesting tidbit: if you are keeping your throttle input steady and switch to either the "Street" or the "Race" mode on the fly, the RPMs bump up and the car accelerates without any additional gas pedal movement. Norman at SP said that they had seen this behavior on some cars - what he is saying (and it makes sense) that the OEM throttle body management is such that you don't get 100% of the TB travel, and the SP management routine moves that knob to 11, hence the surge.
They also say that there may be an improvement in mpgs, because there is no lag in the TB, and there are no "oscillations" of too much/too little throttle on the way to the target speed when you have SB on vs without it. I don't know if this is truly something that can be noticed, but I'm going to spend the next 2 weeks or so driving with the SP on and off to see if there is anything discernible. I am expecting an improvement of the 0-60 times, as there is massive change in responsiveness with the SP on; in fact, I am backing off from the highest "Race" setting (9) to something in the middle (5-6), as the car gets really twitchy under torque steer.