same here, very similiar to KSJC...Operate with only captains on our 604/605 fleet.. Not a problem with professional pilots.
Yes, one of us has to be nominated the "responsible adult" ie Commander and get stiffed with doing the annoying paperwork that comes with AOC ops these days.. But on the whole its a good concept.
if you have to ask the question if its an issue, then either you are an insecure captain who needs the 4th chip to lean up against and abuse your authority with or cant find the buttons whilst sitting in the RHS.
(Wierdly enough, its been the English and French pilots who have been dismayed that a two captain cockpit can even thrive.. Must hark back to the times where a stiff command gradient and massive egos ruled..
old habits die hard I guess..)