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I don't think they have the ability to improve typography, at least not without spending lots of development time (and therefore $$).
The problem is that core rendering engines for both epub (RMSDK) and kepub (QtWebKit) have been abandoned by their respective creators. As far as I know, RMSDK is basically on life support, and Qt completely abandoned QtWebkit, to the point they removed it from later Qt5 releases. And there is no (production level) drop-in replacement for QtWebKit.
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