okay I am sure this has been figured out I just have not seen it.
Very simple all I did is take the Red and yellow wire coming out from the back of the radio and twist them together. Now all you do is take the yellow wire coming from the car harness "12v content""and wire it to the red and yellow u just twisted together bit with a switch in between
harness Car "12v Content"'
___ _________
l o l____red_____ __\___ _____l___l \_l______/
l o l [ Switch]-----Yellow--------{ l - l Ll
l_o_l-----Yellow---- ----{ }--------------{ }---l
now when u have to leave the car for a second up dont want to have to shutdown the radio all the way "like if ur just going to walk over the pay the guy for gas u can just shut off the screen of the radio and when u get back in the car turn it on and ur ready to go to long load time. just every time u know ur going to be out of the car for a while remeber to shut it off.
Any way maybe u like this idea maybe not just putting it out there
I will take some pics and a vid of mine an post it i can explae this to well in text.