Well, I have heard a few people complain that they can't get a scroll mouse working under RedHat, but it works fine in Mandrake. Well, I started with that problem also, and now that I got it working, I guess I will share what I did, and maybe a few others will benefit by this.

Edit the file /etc/sysconfig/mouse to look like this:
MOUSETYPE="imps2"
XMOUSETYPE="IMPS/2"
FULLNAME="Microsoft IntelliMouse (PS/2)"
XEMU3=no
DEVICE=/dev/mouse


I don't think you need the DEVICE line, and you can put whatever you want on the FILLNAME line. The important parts are the MOUSETYPE and XMOUSETYPE.