The field where you currently have Authors can contain MULTIPLE fields, so for instance Authors, #MyShelves would place each book both on a shelf based on it's author, and optionally shelves based on the content of the custom column #MyShelves.
In fact you can list as MANY values as you want there. I currently have #myshelves, #readstatus, series, #newsshelf, #monthadded in mine (admittedly I should remove #newshelf as that is left over from some experimentation I had done). These values are:
#myshelves - Manually defined shelves for books
#readstatus - Computed value based on %read of each book
series - One shelf per series
#monthadded - Computed value as to when a book was added to calibre
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