"Algo mais em que eu possa ajudar?"
I know. This site still runs on Plone 2 with the help and immense competence of my friends at Simples Consultoria and looks obviously dated. With any luck, my work on transmogrifier tools will allow it to smoothly migrate to a new Plone 4 instance in the near future. Stay tuned.
It's hard not to think that the idea of dragging the document instead of the viewport makes sense, in special if your trackpad supports two-finger dragging. It also feels very natural to have things like inertia (when the document continues to scroll when you release the pad with your fingers moving and gradually slows down - or halts when you stop it with your finger) in this mode.
Unfortunately, the only way to enable reverse scrolling (and we are not even considering inertia) on Linux is through an xmodmap hack that affects every pointing device. Even more unfortunate, this mode makes absolutely no sense when you are using a clickwheel (such as the one on your mouse) to scroll.