How about giving admins the ability to throw up a "Please read this" message.
Something like this:
- User submits an edit
- Wikipedia accepts the edit, and...
- Sends user to a "You have an urgent administrative message" page.
User can then:
- Click on the "Read message" button, or
- Just ignore it
A good idea, but it would need to have at least a message queue to handle multiple messages, so you arrive at an internal messaging system. Unfortunately, this would have to be a bit of a hack, as IPs expire rather quickly. With cookies it could be done more reliably but not in all cases. Anyway, I think there's little opposition to more advanced messaging/ban/revert features, they just haven't been coded so far.
Regards,
Erik