I think the Series feature is a great addition to BB. The only thing I would like to see is a connection between the Author and the Series.
The only way to list the series for an Author is to record the information in the Annotation section. The limitation that method has is that it doesn’t show what Series have actually been created on BB.
Some science fiction writers have written numerous series and it would be helpful to keep track of which of their series has/have been created on BB via the Author page, rather than manually search for the Series title.