Filled in Null Values - have to manually make formula to combine

[Benjamin Hill]

Very much a nice-to-have: It works great for filling in null values, so I'm using it more, and ran into the following:

After it finishes, I have to fill-down a formula to combine the actual values with the predicted values:

=IF(NOT(ISBLANK(E2)), E2, F2)

Which isn't so bad, until I'm trying to fill in blanks in 15 or so columns, at which point it gets kinda repetitive.

It would be nice to have the option of the results including a pre-filled column of "original, and if not original, then predicted" all in one place.  It could even use this formula to avoid duplication of data.