A couple notes on this workaround...
1) It requires the Gnome Configuration Editor to be installed, which it appears is not by default. At least, it was not an installed package on my install. I had to add it.
In the Add/Remove Software GUI installation tool it appears as "Editor/admin tool for GConf" aka "gconf-editor-2.26.0-1.fc11"
2) When I deactivated the media keys it caused gnome-settings-daemon to crash on my machine. I logged out and back in and then it worked fine.
We have another thread open on this...
http://forums.fedoraforum.org/showthread.php?t=230514