Spellcheck will not become available for the bookview afaik. Furthermore, if I understood correctly, the featureset for bookview is frozen.
As the spellcheck is pretty fast, what would be the added value of limiting it to a selection? The power of the list generate a list of all misspelled word is in the complete list. One thing you can spot then (which you usually cannot spot otherwise) is misspelled names in the complete text.
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