Got exactly the same problem Benjamin Kay has but on a i686 machine
(Inspiron 6400), although I succeeded in remapping the "Play/Pause"
button to actually Play/Pause : You've got to go to the Global Shortcuts
options in Amarok, remove the shortcut XF86AudioPlay mapped to "Play",
save your prefs, an
Same probleme here, I've got a Dell Inspiron 6400 and the "MediaDirect" key
worked great with Amarok in Gutsy but since Hardy it causes kded to crash.
Protox's advice didn't work for me and when crashed, even if I try to restart
it I can't use the "MediaDirect" nor the volume buttons (which work