how to let the mirror tilt down by itself when in R?
 

This could be really a nice feature, I like to know how to let the RH side mirror tilt down by itself when shift to R, and it will come back to the normal position once shift is not in R position. I know the BMw 5 series has this. In which when you back up the mirror will tilt down at few degrees by itself and will go back to the original position when the shifter is not on R anymore.

i haven't totally thought this though, but off the top of my head...

first you need power mirrors, then a doorlock pulse generator relay and a latching relay and 2 relgular relays triggered by the reverse switch or the lamp bulb wire, Then connected to the power mirror wires that move it up and down.