When you say a custom dictionary, are you talking about a custom wordlist (user wordlist) or a full fledged en_US sized hunspell dictionary.
If the latter, give it an unused language code - region and then set the default epub language to that language code - region. Use that same langcode-region for all that authors books.
Alternatively, I set up separate login/userids when working on specific projects and can therefore install whatever user-dictionaries I want for Sigil under that user id. That actually help keep different client files completely separate. I do this when clean-rooming code for different project that have incompatible software licenses.
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