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@KevinH: If I were you I wouldn't bother with an env var, it will just create confusion and bugs. There is absolutely no reason to use NFD, ever. In all the years the calibre editor has existed there hasn't been a single bug report about NFD. Having Sigil producing EPUB with NFD text is just going to result in broken experiences in other software that doesnt normalize text before operating on it. I highly doubt all the dozens of EPUB viewing software out there does that, for instance, which means search will not work in them for Sigil produced EPUBs with the env var set.
There is *no* good reason to use NFD that I know of, ever, when serializing text. About the only advantage of NFD is that it makes certain operations simpler to implement, such as removing accents. But the difference is negligible. In either case you need to use lookup tables, just in one case the lookup table is larger and anyway this is a problem that was solved robustly in libraries a long time ago.
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