Go CMS Blog: individual ‘Author’ field per post
The blog setting allow to define the author for all posts. While this might be the standard situation for single bloggers, an author field makes particular sense when there exist multiple authors in the blog.
To cover this more general case, I suggest to make the author field an individual field per post. One or multiple authors could be created in the general settings (like e.g. categories), then an author could be selected per post. If multiple authors exist in a blog, the author field could act as a filter similar to e.g. the category field.