The "Disk Eject" Key: A hardware or software feature?

Matrix Agent

Masochist Mascot
I know that on the new macs (i.e. quicksilver) this is a media eject key that works quite nicely. I was wondering if it would be somehow possible to implement this feature on my iBook. I realized that this feature is similar to the sound and brightness controls that replace some of my iBook's function keys. These keys are not changeable in the keyboard panel, so i was thinking that if i replaced my keyboard preferences file with one from a quicksilver, it view one of my iBooks function keys as an eject media key. Think this is possible or is this a hardware dependant feature?
But why not just add the "eject" button to the finder window's tool bar? If you are talking about 9.2, you may be able to achieve your goal by using Resedit and copying only the eject key resource from the G4 to your iBook (You would need to compare copies of both and then add what you need from one to the other). It seem like a lot of work for something that isn't that hard to live without though.