Yep, think there is a need to separate Numbered and 'Sequenced' Series. This seems to happen in transport (we need category level 3/4 Land- Road Passenger Public. Road Passenger Private , Rail, Air- Airports, Aircraft, Sea (etc). ) Things as I am entering Buses Annual (I suppose the same applies to comic annuals), Railway World Annual, Ian Allan abcs, Capital Transport similar geographical or similar books, Railway Books in the likes of 'The Colour Of' series and so on.
Definately would like to see all James Bond / Doctor Who etc items grouped, or groupable, together (Fiction, Genre , Main Character ? )