Limiting the RPM's would be fantastic. The ability for the Cobb device
to monitor attributes like RPM & Speed is AWESOME. Is there a
likelihood the service personnel would disconnect the Cobb device during the service period?
Once the cobb is downloaded they wouldn't be able to turn it off as they would need the actual cobb tuner (which would be at your house) to do so. Go to cobbtuning.com to read about how it works
I'm considering a GPS/GSM gadget, for location, speed & unexpected travel, but that's reactive. Would prefer to keep the key fob altogether.
So why not do that? They don't need the fob once the car is running to move it. In theory if you left the car running they could then take the car to the service bay to do the work. Once they shut it off there will be no starting the car again until the fob is back in the car. In theory they wouldn't need the key from you until the work is done at which point the time from when you handed them your key to the time they pulled your car up would be minimal ensuring very little time for them to joy ride. Just a thought. Then again there might be cases in which multiple start ups or test drives may need to be done to ensure no leaks and such.