I have a GPS windshield mount for my DX, similar to this one:

I was wondering if by placing a stick-on magnetic strip across the backplate the phone rests against would allow the phone to go into multimedia mode, similar to being in the MotoDock, for correcting the portrait orientation that holds constant when the phone is placed in the mount? I am well aware of the Car Dock app that comes with the phone, but it seems that whenever you make or take a call, the orientation remains stuck in portrait (up and down) view instead of landscape (sideways) view. This makes it very hard to see who is calling because you have to tilt your head sideways. Anyone have any thoughts on this idea?