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@Townk - this plugin offers just a simple and crude way to grab an ISBN primarily for metadata gathering purposes. As soon as you download metadata it will overwrite the ISBN again with one of the matches based on what you selected. So it is fairly pointless for most people to try to get too picky about which ISBN they have associated with the book, because of the way ISBN groups and calibre metadata download works.
So I am not going to try to make this plugin more interactive in that way (it gets really complicated when you have multiple books selected etc and becomes a whole lot of UI work for something few people really care about).
In the first iterations of this plugin it tried to have some logic around detecting certain text to reduce the false positives like searching for "ISBN" etc. However that was a failure as there is no universal standard by which publishers put this in their books. It just all gets too hard basically - so instead the plugin searches to find the first valid ISBN it can find and that is what will get used. And if your book unfortunately has an advertisement for some other book inside it listing it's ISBN on that page, well then you will end up with the wrong one from that too.
Treat it as a 98% plugin - it gets it right awy more times than it gets it wrong, but it will always require human interaction to have a 100% success rate.
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