As far as I'm aware there is no way to save such tweaks for different libraries. I wish there was because I'm in the same boat. My workaround is to leave it at the regular author sort that I use for my 'real books' library then in my fanfiction library any author that has spaces in their name I replace it with an underscore. It's not ideal but it's the best method I can think to workaround the issue.
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