RelEng has released a new plug-in to automated map file updates.
This plug-in adds a "Release..." action to the Team menu. When you "Release..." your project(s) the plug-in will tag your project(s) as a specified version AND update the corresponding *.map file entries.
You must have the map files loaded in your workspace and you must still release the map file changes to the repository.
This plug-in deactivates the map file validation since it is no longer needed.