RAT 5
Why not just let the pilot use the best mode for the job; or allow airlines to design their own SOP's within a/c design capabilities?
Airlines have deviated from manufacturer's procedures and some of them had serious incidents because this is a fly by wire aircraft and the software and hardware used to achieve the design philosophy is not available to the airlines. So something that appears innocuous may or may not be so and you will be better off to check that with Airbus. Airlines can and do certain things differently but if they seek airbus approval it will be safer. Also airbus upgrades its aircrafts with better computers or equipment so somebody needs to keep track of that and modify the procedures suitably. Lastly an airline making procedures after careful consideration and individual pilot doing things differently is not same. That will lead to non standardisation.