Code:
{author_sort:||,}{series:| - | }{series_index:0>3s}
Target = author_sort and authors.
I was happy a bit too early: for books where there is no series information, the Kindle still displays "firstname lastname", but the sorting is all right across all books, so...
Maybe that can be tricked with a blank after the comma. Will try it tonight.
Also, if a series has more than one author, like authors Preston/Child with the Agent Pendergast series, the series is grouped, however the index is wrong. Books will then be ordered by first mentioned author (Preston), then title. But at least all information is visible incl. index numbers, and the series is displayed in one block. I got used to this behaviour with my Sony already.
Attention: the plug will NOT work for series written by several independent authors, in my case there's only one: Justifiers. It's written so badly however, that I don't think I'll read it again
In such case I just use the search field which works like a charm and suggests the whole series after typing in a few letters...