Independant Tilt of Side Rearview Mirrors

I would like to have the ability to Tilt Side Rear View Mirror on Passenger Side ONLY so as to see curbs when parallel parking, while keeping driver's side mirror in the normal position so I can still see upcoming traffic on driver's side. Presently, when both side mirrors tilt you cannot see, in the driver's side mirror, if a car is approaching from the rear as it is pointing down. This creates a dangerous situation.