One nifty trick that I've added to my xmodmap is changing the full screen F6 to F11... F11 is what every browser I've tried so far (konqueror, galeon, epiphany, iceweasel, kazahakaske (or whatever)) uses for a full screen key. F6 does pretty much nothing on the debian side. I didn't add it to the original because I dunno how important it is to anyone and only works for browsers I think...but as an example of what qole is saying:
Thanks for the list qole.. I'll see what else I can change using those keys.