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There won't be anything interesting in an expansion focused on sailors, as there's a limited number of sailor-warriors. However, an expansion based on the King of Shamans could be great; there are plenty of shamans with their spirits, and each has unique abilities, so it wouldn't be too difficult to come up with something. Of course, you'd have to work on the plot and the overall mechanics.
I've seen, read, and even discussed them, although I haven't participated. The most successful and interesting ones are almost always those that rely on the creative inspiration of the lead developer, who comes up with something new, rather than completely building a setting based on an existing work.