Nope - nothing. I know in other applications the circle thingy with arrows inside comes up instead of the cursor, but not in Word. Excel I'm not too bothered about, it's just that I work with a few large docs in Word, so having to press page up and down all the time is a right pain in the proverbial! (I'm scrolling up and down this page.....arrgghh, this is so frustrating!)
I should also point out that if you go to Device Manager (My Computer>Properties>Device Manager and highlight Mice and other pointing devices before clocking on its Properties, you should get a menu up that includes an Advanced tab.
You can then configure your mouse actions as required.
This is the case with XP Pro (it's a while since I used 98SE), so not quite sure if its exactly the same, although the basic approach will be.