Hi!
Thanks first, for the useful tips. I also changed the Zoomslider into a scroller, but the scroll speed turned out to be very slooow. Since I don't know how to speed it up (maybe something like ScrollDownx3

I decided to have a pageUp/pageDown Button function on the slider.
I got some errors while checking it out, so I'll just note what to take care of.
As posted before <C319... and <C320 are the two identifiers for the Zoom Slider. The number behind ...Type=... refers to what type of butten will be activated.
Type=6 means it is a continuarly sliding function, like for zooming or scrolling. But if you want the whole thing to work as a normal Button like pageUp or page Down you need to change it to:
Type=5! This means, every move up or down is seen as one single keypress.
Therefore you also need to change the function from "Activator" to "KeySeq"
So the whole thing looks like this after modification (I first searched for "Firefox" in the command.xml and just changed it there):
<Application UniqueName="MozillaUIWindowClass" AppName="Mozilla Firefox 1.5">
<C319 Type="5" KeySeq="pageup" />
<C320 Type="5" KeySeq="pagedown" />
Keep on modifying everybody!
and tell me, if you know how to speed the scrolling function of that zoomslider up...