I'd like to elaborate beyond just voting: Personally, I don't care either way, as I most often use search to find the book(s) I want. But, as I see it, this would make sorting more consistent for international users (for example I personally feel that "ö" should follow "o", or, at least be sorted in the same area), and that, in my eyes would be a Good Thing. One modifier applies, though: If it's worth the trouble for you developers. If this means you have to rip apart everything and rewrite most of it, my vote would change to no.
Another comment regarding sorting that goes slightly off-topic: Personally, I'd much more like to see an option to include non- english articles in the list that Calibre ignores when sorting, like the german "der, die, das". Optimally, this would be implemented as a tweak, pre-filled with the most common articles, say english, french, spanish and german. For this, the same modifier as above applies.
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