If the PF decides to hand fly (no AP, A/T), wouldn't it be wise for the PM's FD to be up so he could more effectively monitor the PF's performance
Never having flown an Airbus, so stand to be corrected. But how does having a FD on more effectively monitor the PF's performance? The PFD has a whole host of basic flying information to look at and that is all a competent pilot should need to "monitor." I wouldn't be at all surprised to read in future medical journals that concentrating a pilot's stare on the FD needles has been found to be the cause of old pilots going cross-eyed in their dotage