I am having similar a similar problem. When I'm running Amarok (on openSuSE 11.1 / KDE 4.1), I can't use the space key in any other application because it will Pause/Play the Amarok player instead of inserting a space character in whatever document I'm writing. I've tried going into Amarok's Settings (menu option) to 'Configure Shortcuts' and 'Configure Global Shortcuts' by changing the keyboard shortcut for the Pause/Play function, or to eliminate that keyboard shortcut altogether, but that has proven futile... the default shortcut still applies after the change, whether I'm using Amarok immediately, shutdown-and-restart, or shutdown-reboot-and-restart.
In fact, when I shutdown Amarok and restart it, the Shift-key shortcut is back on the list (even though other changes I've made to the shortcuts have stayed the way I changed them). I can't get rid of the Shift-key shortcut and it hijacks the Shift-key input whenever Amarok is running.
Any ideas either on how to make a custom keyboard-shortcut stick, or how to disable keyboard shortcuts altogether in Amarok?