This post might not help all that much but, here goes...
I used a Macally IceKey on my old iMac G4 and I loved the feel of it. To this day it is the best keyboard I ever used. But at the time I was running PAnther (Mac OS X 10.3.x) and I remember that if you didn't install the driver, some of the keys would not be recognized by the system. I haven't tried it in Tiger, I left it as the only keyboard for the old iGloo and at the moment I can't recall if I saw under Panther a pref pane for the Macally.
Under Tiger (Mac OS X 10.4.x) the only thing I can see that would help you configure the F13 - F15 keys would be in the
System Preferences --->
Keyboard & Mouse (in the
Hardware section) --->
Keyboard Shortcuts tab.
This webpage, for instance lists all the built-in keyboard shortcuts.
That's a freebie solution but I would be hard pressed to suggesting to start changing all those built-in shortcuts. Maybe you'd need a third-party program that would help make this as painless as possible for you. I found this,
fKeys, but it's only for PowerPC-based Macs, not compatible for Intel-based Macs. Unless it would run under Rosetta? But that could make the whole thing slow.
Anyway, I guess you could try it or google till you do find a viable solution to your problem.
Hope this helps a little. :girl:
