From http://forums.musicbrainz.org/viewtopic.php?pid=13478#p13478 (and mentioned somewhere else too)

Since most works are conceptually linked to at least one "primary" artist, maybe the performer or producer of the recording; maybe a composer I think most people would expect edits such as merges, or other work-specific edits to show up on the "open edits" page of 1 or more of the involved artists.

Since they don't directly belong to any artists, perhaps we need to think about how this might work regarding specific ARs that are deemed "more important" than others - maybe they should show up on any of the n composer's open edits page?