I have read everything I could find on Fill Handles, but I still don't know
how to set the fill handle defaults.

I know there must be column-specific defaults, becuase I have a spread sheet
where (for some reason) some columns automatically fill in a series when I
drag the fill handle and other columns automatically copy when I drag the
fill handle (all colums are numbers). And, often I want the opposite default
to the one I have (doesn't it figure ;).

I know I can use Ctrl while dragging to temporarily switch the default
between copy and series. But I would really prefer to set each column to my
specifications, instead of trying to remember which column is set which way
(by fluke).

Thanks in advance.