dired-backup-diff only diffs with the latest backup

[Dan Jacobson]

    ESC = runs the command dired-backup-diff
    Diff this file with its backup file or vice versa.
    Uses the latest backup, if there are several numerical backups.

How inflexible.

    With prefix arg, prompt for argument SWITCHES which is options for `diff'.

You could make this: if ARG is 1,2,3... diff with the next, second to
next... latest backup.  Otherwise prompt for switches. If ARG is -1 -2
-3... do the same as 1, 2, 3, but also prompt for switches.
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