But the Airbus procedure is quite clear : If you choose to NOT follow the FD, turn them OFF.
Very important.
And a 'normal' op where this
required is a PRM breakout.
It's interesting that if the PNF deselects both FD's first (as required) and then the PF elects to use TOGA rather than CLB on the breakout, the FD's reappear in TOGA (due to flaps extended) and must be again deselected by the PNF.
Making radio calls, watching a TCAS target, reconfiguring, resetting the FCU by the PNF, and hand flying raw data for the PF can all be quite challenging and must be a very disciplined drill.
When the FD's are reselected after the breakout, care must be taken to not fly them until proper FMA mode indications are verified, some modes not being selectable until after re-engagement.
(edit: BTW for B44, the same requirement to turn off the FD's on a PRM breakout exists in the automated Boeing's also, because sometimes people inadvertantly do dumb things, even in Boeing's.
)