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Hotkeys
about:
The HotKeys daemon listens for the "special" hotkeys that you won't normally use on your Internet/Multimedia keyboards. The buttons perform their intended behaviors, such as volume up and down, mute the speaker, or launch applications. It features an XML-based keycode configuration file format, which makes it possible to define the hotkeys to launch any programs you want.
Homepage  http://ypwong.org/hotkeys/

ACME
about:
ACME is a small GNOME tool to make use of the multimedia buttons present on most laptops and Internet keyboards: Volume, Brightness, Power, Eject, My Home, Search, E-Mail, Sleep, Screensaver, Finance, WWW, Calculator, Record, Close Window, Shade Window, Play, Stop, Pause, Previous, Next, Groups, Media, Refresh, and Help buttons. It works on all the platforms GNOME supports (laptops and PCs). It uses either OSS or ALSA for Volume control.
Homepage  http://www.hadess.net/misc-code.php3

Если не подойдут, тогда поподробней про keycode - что делал, что не получилось и т. д. Вместе разберемся