Does anyone know of any hacks for OSX that will set the mute button to always mute rather than toggle? I would feel much better knowing that when I am hitting the mute button to avoid producing any sound, I will not accidentally be turning the sound back on!
I don't think there is any way to do this using the built-in tools in OS X. You can however do this pretty easily in applescript:
If not, FastScripts is specifically meant to assign keyboard shortcuts to Applescript, so you could basically find F9 to that command above and hit FN+MUTE and it would mute every time.