Things I'd like to see changed on tthe 737:
Get rid of the "Area of Responsibility" concept. It is far too complicated depending who is PF for the leg, whether the aircraft is stopped or moving on the ground etc. Make the captain responsible for starting the engines and not splitting who operates the start levers and who operates the start switch. On the -200 the captain did both and then for some unknown reason Boeing thought that was too complicated for the captain to do both actions and changed the checks to share the starting.
Go back to the original concept of checklist operation. One pilot challenges and the other responds. Not like now where one pilot challenges himself and responds to himself while the other pilot observes. Except on most occasions the observing pilot does not observe because he is too busy fiddling with the FMC or scratching himself under the lap strap while looking out of the window waiting for his turn to respond.