I'd like to suggest a map edit history if one hasn't been suggested already. Google Mapmaker has something that keeps track and allows for easy reverts to previous versions. Would take the guesswork out of trying to repair something someone may have done. Also, what leocylau mentioned in that other thread seems to relate to the idea as well.
leocylau wrote:Regarding the Editor Note, I like what OpenStreetMap has. Like this:
http://www.openstreetmap.org/note/new#m ... layers=CND
I also like the feature on OpenStreetMap like this:
When you click on a segment, it gives you who is the last editor and there is a history view too.