Remap Super+arrow key to home/end
How about a combination of xdotool and xbindkeys, with a .xbindkeysrc like:
"xdotool key Next"
Mod4 + Down
"xdotool key Prior"
Mod4 + Up
(on my system windows key is bound to Hyper_L = Mod4)
Another (very cool) option if you don't mind using the mouse could be to use gestures. For instance on my netbook the End key is a pain to use (Fn+Pagedown, and hard to reach). I installed easystroke and set it up so i can just make a "V" like gesture and it sends End. For Pagedown, it's a down-up "|" gesture (begins to feel a lot like an iphone!)