You should be able to operate the navigation via voice commands, even while the car is moving. I know I can do it in mine. I have factory navigation and the 302A (reverse camera, parking sensors, and Homelink-like visor buttons) package.
I'd need to look at the diagrams much more closely to figure out how to enable video while driving. Just a guess here, but since Ford now uses the network busses to control many of the functions, you may not be able to do this by simply disconnecting a wire. And unless I didn't see it, I don't think that the VSS wire is even connected to the audio system anymore---it's multiplexed into the network bus.
I'd need to look at the diagrams much more closely to figure out how to enable video while driving. Just a guess here, but since Ford now uses the network busses to control many of the functions, you may not be able to do this by simply disconnecting a wire. And unless I didn't see it, I don't think that the VSS wire is even connected to the audio system anymore---it's multiplexed into the network bus.
