Some forums I go on elsewhere have an "Up" button:
At 1st I thought this was a useless feature. However, in actual fact having started using it, it's a really useful way of getting back to the top of the page from very quickly and saves loads of scrolling and wear on the old wrists.
It just kind of hovers in the right margin next to the scroll bar until you need it. One click and you're all the way back at the top of the page.
Any chance?