Does this feature (ability to autorestore or, even, manually from within C::B) implemented since 2007... I don't see it.
Also, I've noticed if you choose the option to save as original files (so, overwrite them), C::B still show the "*" beside filenames on its editor tabs. It would be smart that the autosave plugin warns C::B about external change (or do C::B considers the action of autosave as an internal save).
Third, it could be useful to have an option "save in a subdirectory" (using original filenames) : this way, external restore by hand will be just a simple copy, accepting the overwriting warning from OS. Just an idea.