I posted a note about this a few days back, and it occurred to me to now list it in the right place - the 'Plugin Wishlist category.
The concept is similar to (but not the same as) the bundled Revert Manager.
The idea is for admins to be able to list (recent) contributions just from one particular user (or via their logged IP address). That way, if a nefarious logged-in user had decided on some amusing vandalism, it would be very easy to bulk-revert all their content (prior to deleting them as a user of course).
As always with plug-in wishes, I 'wish' I could code thisi myself, but I don't have the skillset.