How to emulate wheel?

Hi, i have a kensigton trackball with two buttons, its pretty neat, but i have a problem, theren is no wheel, its damn irritating when surfing the internets..

Can i do such that i can press down a certain key to use the trackball to "scroll" with ?

And plz, no comment about trackballs being lame...

Thanks in advance!

#2
I love this trackball, so seriously, you are not even trying to answer my question here..

#3 /b/