Yellow Pen - Apologies for the misunderstanding, however, what you suggest is happening is far worse than what I thought was a simple service matter. What you describe would essentially amount to tampering with the installed equipment on an airliner.
I'm not familiar with Aviation Law but could imagine that such an offence would carry a considerable penalty if convicted. For the professional CC to engage in such an activity in the interests of increasing their pay sounds pretty bad to me. Who knows what other systems could be inadvertently disrupted in the process?
To your knowledge, how has BA management handled this matter when brought to its attention?