I use Expose (F9 F10 F11) from time to time. My System is Panther (10.3.9).
Its possible in the System Preferences of Expose to change which keystroke turns it on, its also possible to nominate either the Shift, Option, Control or Command keys with any of the listed choices. Problem is none of these choices are good enough for my dilemna which is that I use an unusual Open Source Graphics program which uses all of those choices in its command structure. What I would prefer to be able to do is change the Expose kets to F13 F14 and F15, problem is that the pull down menu of Expose doesn't offer F14 and or F15 as alternative keystrokes although F13 is listed in there.
I doubt that anyone can tell me how to add F14 and F15 to the pull down menu tn Expose Preferences but I offer this interesting discovery as a reward for at least reading this post - its a great way to impress. Hold down the Shift key then press F9.