This group would be similar to phabricator's one.
IE, it will allow users to edit assignees of other users changes. Would allow them to delete there own changes if they were uploaded by mistake (allows us to reduce our reindex time if we delete spammy changes).
This would also be used in the future to allow users to make there changes private or not and to allow users to edit the hashtag feature.
This could be expanded to allow rebasing other users changes too.
This could also be expanded to allow users to do other things.