I really have no idea what you are on about AdM especially the Ex-boeing comparison.
In general there is a time and a place for learning these things. I suggest that 3000ft AAL and about to start an approach is not that place nor time.
True there is hardly anything that can't be done through the FMGC, same applies to boeing FMS btw, and you have to know how these advanced features work. But you also need to realise that some of these advanced features are more about planning then short notice manipulation of the aircrafts flightpath. Why else do we have an FCU?
So my advice to the OP: sure build a circling approach with prescribed tracks or add a 10nm final point if you think that is what you will get. But do it in the cruise or a holding pattern. For short notice changes or when you really should stay heads-up use the FCU.
If ATC asks something you think is too complicated, tell them you are unable.
Last edited by 737Jock; 15th Jan 2013 at 11:02.