Oh my, TP you're at it again.......
I'm gonna let this one slide but for cac737, if downroute inter-crew interaction is important to you I would highly suggest this is NOT the airline for you.
Suggest you post the same question on Pprune to get a more "rounded" answer.
http://www.pprune.org/forums/forumdisplay.php?f=44
They don't call them "slam-clickers" and "noodle-suckers" for nothing.
Dune