I think this is great idea. It is really annoying to lock the device after answered phone call, for example in the car - then the lock button is on the bottom and its impossible to reach it without flipping the phone in the hand. And the power button is then right below my thumb waiting to be pushed...

Another thing is that whole device is upside down... the lock switch should be on the opposite side, and the headphone jack too. But its hardware issue, to be hopefully fixed in N910