Why don't you just go to panasonics site and get the manual for it. It should have a wiring diagram for it. I am sure that is would be simple to wire it so you can watch and drive. I believe that its not supposed to play unless the e-brake is set. But that sounds like a simple "don't wire that wire" kind of thing. GL.
as long as your hu doesnt have built-in navigation that can sense when u are moving (wheel sensor but most important GPS)... then u can bypass it by grounding the e-brake wire or buying a periphial to bypass it or hooking up a relay...
the pioneer z1 hu are the only 1 that we couldnt get bypassed.. cause the built in navigation still told the hu, we are moving (GPS)... it would play then cut right back out...