I can see your point, but as you said they will fix their mistakes. If you really wanted to make sure they don't mess it up... Tell the dealer you want to be present when they fix all your stuff, they most likeley won't do this, but bring up your old incidences and maybe they can get a supervisor to make sure they don't screw it up?. Sure this may be time consuming but you would have to deal with this stuff sometime anyway, why not get it done for free?