There's this tweak
Quote:
ID: authors_split_regex
By default, calibre splits a string containing multiple author names on
ampersands and the words "and" and "with". You can customize the splitting
by changing the regular expression below. Strings are split on whatever the
specified regular expression matches, in addition to ampersands.
Default: r'(?i),?\s+(and|with)\s+'
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I don't know if it can be made to ignore the '&' - maybe a regex guru will tell us
I replace the '&' with a '+' - so Muscle + Fitness, House + Garden etc
For magazines/journal etc I also put titles in author, and I put the nominal date eg 2014-02, issue number etc in title. Good to know someone else does something similar
BR