not that i know, but i'm with you

though my problem is slightly different. i'm quite annoyed that whenever i accidentally tap the area outside the numpad, it suddenly ask me whether i want to switch off the device
happened to me once or twice that the phone turned off for real because of that

anyhow, for your case. can't just anybody press the power button anytime to turn off your phone? though in this case, people will be tempted more to do that