I will try to look for an article that teaches you how to retrofit paddle shifters to the x5 and i don't think you need to code it. The only thing you have to do first is move the gear shift leaver to the sport mode and then it's equivalent to upshifting and downshifting with the lever but with the paddles. I read it a long time ago and considered it. let me do some digging and get back to you guys.