@mnementh I also looked at one of these calculator kits last year and decided against it, however I may just review that decision to break the boredom up.
With regard to leaving the AT in sport mode, I have to oppose your view in that it makes no difference in mpg, it actually drags the mpg down to a lower figure, causes more pollution, and that is something that we should all be looking to reduce for the sake of the planet, plus it also makes far more noise pollution as well. My car has Driving and Sports mode on the transmission, and driving in sports mode, the car is still in 2nd gear at 30mph and around 2,500rpm and the noise level is much higher than leaving it in D mode and the transmission is in 4th at 30mph with just 1600rpm and the mpg figure is greatly reduced as is engine wear and CO2 emissions.
Traction and stability control are always ON by default and I have only ever switched it off a couple of times and there is so much torque available that it is very easy to pull wheel spin when pulling away and also acceleration is noticeably quicker with it off once wheel spin has stopped.
Even in snow, I leave it in the on setting and provided you have a gentle right foot, no problems pulling away on snow. Besides over here our insurers are always looking for ways to avoid paying on a claim, that I'm sure, that should you have an accident with the traction off, that they would refuse to honour the policy, claiming that was a major contributing factor to the accident. As to cracking the CPU, that would unless you declared it prior to insuring the car and accepting a punishing premium as a result, render your policy null and void when their inspectors discovered it after an accident.