The start/stop I believe is a requirement to do with their emission statistics but I may be wrong, you certainly can't disable it. There is a work around and that is to put the car into sports mode as that disables it. Speed warning noise I don't get so can't help there so maybe I turned that off when I got the car it's three years old now and I can't remember. And finally the start up mode, again I believe it always starts up in the same mode and I don't think there's a code for that either.