2
If you create a group "Editors", you can give them "Module Admin rights", and they should be able to edit the news article.
But I don't think that you'll be able to do so at the "topic level".
If I'm not mistaken, Publisher offers moderator option at the "topic level", so it might be possible there, but you would need to test it.
I think, it would be a good feature to add in a future releases of our content modules.