A great little enhancement of the tab functionality could be the following:
The user clicks on a tab (which is already selected) and the page is rolled down to the bottom (or the top of the page isn’t shown) then a click on the tab again will make the page scroll to the top.
I’m using tabbing multiple times when I have drilled down on a specific tab. It is actually a good way to get to the first page of a tab. But it is not possible to go the the top of the first page of the tab