That's a Finder shortcut, not a global shortcut. FKeys, on the other hand, are processed by the Event Manager.Command-F shortcut doesn't work?
Inside Macintosh volume V covers the Apple Extended Keyboard and shows how to program the function keys for use in an application.I'm wondering if Apple ever supported Function Keys in OS of yore, do they do so in X?
Try this: Launcher FKey
Don't forget Cmd-Delete... I miss that one quite a bit. I'll definitely give that Launcher app a go!