Managing/exporting users
Mmm... that’s a nice idea.
Thinking out loud...?
If you have a trackeItem for registered users I wonder if it would be possible to find some kind of flag in the user preferences (validated vs not validated). If yes I believe a plugin listExecute would be able to filter on this flag and send an email automatically every day (or any period using the scheduler and a cronjob) to the user that didn’t complete validation.