@markdek - as you said yourself in an earlier post, the Kindle has no concept of reading order. So this plugin does not make any attempt to "retain it" when you sync to your device. All it can do is send the books in a list to your Kindle, the ability to order a list for that purpose is irrelevant.
So the list order is only "useful" for those who directly use Calibre, either to view their list when deciding what to read next on their Kindle, or who read books from Calibre directly.
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