Speed up and slow down, the auto-scroll.
 

When selecting a range of cells, and you have to begin scrolling off the
bottom on the screen:

At first the scrolling is painfully too slow to be usable. Then almost
instantly, the auto-scrolling to too fact, that you've scrolled past the end
of your spreadsheet by thousands of rows.

Everyone has the same problem, ping-ponging around as they try to reach
their target cell. Eventually you have to just sit there in "slow"
auto-scroll mode, holding down the mouse still, waiting for it to scroll into
view.

Tweak the scroll speed to what it should be - and i think everyone would
have the same "sense" of what is too fast, or too slow. As an example:
Internet Explorer's second fastest scroll speed when in
"middle-mouse-button-down-scrolling" is the top speed Excel should have.

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