I don't know how much work is involved, but if it were possible I'd like a special page that displays all users who have been registered for more than (?)6 months (or a year?) without ever having contributed. I see little point in keeping bot registrations, so I'd like to find a routine for getting rid of them. What do you think? Is there a better way?
I think that doing the page itself is quite easy. But one needs to consider that users can have a log entries in addition to edits, and some users just log in to change preferences. Maybe we could narrow the search to users who haven't logged in after creating the account. We might still catch some false positives though.