Ford Sync MyKey

I think the MyKey does not offer enough choices when setting up restrictions for younger drivers.  The only speed limitation is 80 mph and to mute the radio over at a few other mph.  I would love to have the peace of mind knowing that my child isn't driving 80mph recklessly.  Please allow restriction choices of 55 up to 80.  I am sure that rental markets would like this option as well.  I would like the car to be more ascertive with the seat belt minder as well.  Please make the Sync an even better safety tool.  Thanks.