So my thought is... have a pin or sign or some other visible marker on the editor map. This will not push trough to the client. The purpose of this marker would be to inform all editors who happen across it of something.
"This road has been disconnected do to construction." "Please do not connect until Oct. 2014". Something like that. Quick... 1 sentence notice for other editors. That way others aren't left trying to decide if an issue is an error that needs corrected or done for a particular reason.
Should be easy to implement if you all likes.