Per the comments later on- disable AutoAddDevices TEMPORARILY. Adjust the key delay/repeat until it is what is desired, then re-enable AutoAddDevices. It's a PITA if it takes you awhile to tweak your keyboard repeat just-right, but it works. Once you re-enable AutoAddDevices- your multimedia, laptop function, and other special keys should work again (assuming they did to begin with). Also- remember to restart X after each step.
Per the comments later on- disable AutoAddDevices TEMPORARILY. Adjust the key delay/repeat until it is what is desired, then re-enable AutoAddDevices. It's a PITA if it takes you awhile to tweak your keyboard repeat just-right, but it works. Once you re-enable AutoAddDevices- your multimedia, laptop function, and other special keys should work again (assuming they did to begin with). Also- remember to restart X after each step.