@the guys doing the reprogramming:
if the code looks just like the sample posted on the first page, I would dare to just add an extra item in the menu, and have 3 options. OK, it's a bigger risk than changing one of the available options, but it's just a minor difference in 'risk factor'. I'd be more than happy to try that in my own car, and post the results, if you need a risk-taker...
If that works out, who knows what other stuff can be made available in the menu...