Yes, the absence of a true italic is disturbing; regretfully, there is no simple easy answer to the problem.
Replacing the existing TTF files with Open Type TTC files will not work as there are not (as far as has been learned from the outside) the drivers in the Reader to utilize the additional information. Even existing hinting and kerning data seems to be ignored.
The two possible solutions to the problem both involve creating your own ebooks. The first one is to make PDF files sized for the Reader with embedded fonts. The files will be larger page turns slower than a PDF without embedded fonts.
The other way is to create a custom LRF through BookDesigner with embedded fonts. It too will be larger and have slower page turns than one that uses the default fonts.
I hope this helps.
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