Limiting Blackberrying to working hours

I was struck by this item from Automotive News: VW is going to ensure that having a BlackBerry does not intrude into its executives' private lives - by craftily ensuring that they shut off email at the end of the working day and start it up at the beginning of the next one. Isn't technology fantastic? Oh, to be able to survive without email being pushed at you all the time. My BB shuts off at 11 pm and starts up again at 6 am: I set it to do that, and I guess a VW executive could do the same - however, setting mine to shut down completely does mean that the phone doesn't ring either - not a bad thing in the middle of the night ...