A new Linux Mint 13 KDE LTS user is born

Only slight problem after few hours of use is that the mouse wheel is scolling pages too fast. I've tried to adjust the speed from the System settings > Input devices, value for the "Mouse wheel scrolls by" is now "1 line" (the smallest value possible). And I tried to fix the problem by installing "smooth wheel" add-on for firexox but no visible cure for the problem. The mouse is "Microsoft Wireless mobile mouse 3000 v20" (sorry for the first dirty word, maybe this explains all for this problem

edit: touchpad scrolling is working as it should, so the problem is with the wireless mouse..
Cheers!
-fin2cv-
Finland