Suggestion: reverse index column

I have a lot of photo sessions, and that folder uses the index column. However, it´s not possible to reverse it.

For example, if we could reverse that column, the folder at the bottom, which is the oldest one, would have
index #1, which would not change, when new sessions are added to the top position (the folders are sorted
by date, descending). That way we could have fixed index numbers (index #1 stays index #1, etc.), knowing,
for example, folder #35 is always the same. I think, this would be an useful enhancement of the index function.