and I notice that despite being the handling pilot once on the ground (normal for most B737 operators, as most only have a tiller on the LHS), he insists on turning off the landing lights.
This is definitely not in accord with the Boeing "area of responsibility" policy.
Maybe he is just one of those "these are all MY buttons and switches" type of dudes..........
Oh come on. Are you seriously getting into a knot over landing light switches? Your paranoia over "areas of responsibility" appears to be taking over from KISS. The Boeing AOR is for the blind obedience of fools and the guidance of wise men.
I suppose you think the FO should switch the lights to Landing for the takeoff because the captain's too busy...