Some weeks ago somebody proposed a way of indicating that he is just expecting a short reply to this email (for example yes/no). I think this is pretty close.

Some weeks ago somebody proposed a way of indicating that he is just expecting a short reply to this email (for example yes/no). I think this is pretty close. Also I can see uses for this on business systems. Notifications are send via email, could be useful to make it possible for users to also take action in their inbox without proceeding to web.