Imagine this situation:

1. A user creates an ad, which should be accepted by the admin.
2. Admin gets notified by email, that there's new listing to be accepted.
3. Admin reviews the listing and rejects it with some comment.
4. User gets a mail notification that the listing was rejected and needs editing.
5. User edits the listing.
6. ... What should happen now?

I would think that the admin gets another email stating that the listing was edited an need to be reviewed. But admin doesn't get any notification. So how is he supposed to know when the user edits the listing?

Should the admin be notified via email when a user edits his listing?

@morfik
Admin toolbar should show counter of listings pending validation.
Plugin does not send notifications to admin right now.

I know, but user can edit his listing anytime, and with this setup I have to check again and again to see whether the user already did it. It's not really convenient to the admin.

See your point, we may add notifications in future.