Replacing "е" with "ё" (for example, in a track title) is considered as auto-edit and accepted immediately. Replacing dash (minus, "-") with em-dash (long dash, "—") is NOT considered as auto-edit and takes a week to apply. I believe such change should be treated as auto-edit too.

See also forum thread: http://forums.musicbrainz.org/viewtopic.php?id=5647