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The user category plug in doesn't allow one to only add "selected books", by author is the closest, but there are authors who write non fiction and fiction like Isaac Asimov, so the user category plug in doesn't work for Scifi or Must Read group.

I'll stick with that ugly nested column as it's the lessor of all evils across my three platforms.
I've created a series for my "Must Read" books, but it isn't really right is it, Ideally I'd like these non series collections to be grouped in un-nested stand alone group/titles.

I've also created a series called "Human Servitude", it contains books by various authors, The series numbering is according to date published which I manually enterd. Some readers can't list the books by "Published Date". To me it's important to list my entire collection by Authors > Published Date - (default to title if no published is date present) . It's seems logical to read non series books of the same author by published date rather than title sort.
anyway I'm rambling here....

Many thanks for your time.