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You need to keep in mind, though, that Calibre is not designed for "working on text", as you say- it's designed to convert and manage books.
That said, I'm a believer in the Zero-One-Infinity rule of software design, as long as the interface isn't too cluttered- so if you can figure out a way to make a potentially unlimited list, that'd be the best solution, if not, I don't think it'll be much difference if we have three fields as opposed to six or however many you'd put in- there'll always be people begging for more.
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