I'm surprised that nobody has pointed out that the rudder pedals on the 330/340 aircraft are different from those on the 320 series - they are much like most other transport aircraft and allow you to keep your heels on the floor. I never heard a reason for the re-design, just assumed that pilot feedback was not in favour of the rather unique 320 setup.
Having said that I hope my memory serves well, been retired for over seven years now.
FWIW the rudder pedals were one feature of the 320 that I did not appreciate in an otherwise spectacular airplane. At my firm there was no rigid protocol for the placment of your feet - I kept my heels on the floor which made for some interesting footwork when it came time to apply the brakes in a strong crosswind. The 330/340 was much better.