Ooh crap, I forgot to mention the traction systems!
Bit late now, but you cannot turn them off fully on the later ones: The very early ones were hot-wireable (see the Formula Women programme), then there was a year ('04 I think) where off meant off, then after that it became nearly impossible. Lexx would prob know more on this subject than me, but my friend who has a track one specifically sought out an '04 for this very reason.