at the same time all clicks still select the item you are over, which means that it's very easy to select multiple items which are not viewable at once and would require scrolling to see the next.
this way you don't have to go back to the scrollbar over and over again when choosing multiple items distributed in a folder with many documents or finding a certain item.
[Editor's note: We published a hint on doing this in column view a while back, but no mention was made of the fact that it works in open and save dialogs as well.]

