@byblo: The reason you can't to non-book searches for these dictionaries is due to the license. The licence Kobo has for these dictionaries mean they are not allowed to do this. If someone publishes a hack to enable the search, Kobo could see that as a problem for them. Replacing the dictionary is not actually supported by Kobo. So, it is not surprising that Kobo don't enable the search when you replace the dictionary.
I would expect the same goes for the fonts. Kobo have licensed them, so protecting them makes sense. Any that are open source or under some other free license, should be available from elsewhere.
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