I can't believe the amount of drivel being typed on this thread if you are an experienced and proffesional pilot you should be able to operate from either seat particularlly if you have any significant experience on type. If your are already a captain you should be well aware of what the First officers duties are if you don't call your chief pilot and resign as your to thick to be a captain!
For gods sake guys were not talking rocket science here, only a 2 foot move besides during training we often operate from either seat with no major problems.
I suspect that the only danger is that some ego's may get damaged but as far as I'm aware that is not a life threatening condition!
Any non pilot reading this thread must think we're arse***ls. I see absolutly no saftey issue with this at all after all the millitary do this a lot I have personally operated many large aircraft from either seat and the Airbus A319 is by far the easiest type to change seats on!
Please stop lowering our proffesion with such nonsence!