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@Dzha: Sounds good except I'm not sure about a new QLinuxFbScreen. You could just add the full refresh function to the screen from my package, and use the static QScreen::instance() function to get a pointer to it. In your case, it'd be safe to simply cast that instance pointer to the Kindle screen version from the package, and use that.
I think in testing I was doing this sort of thing for the mouse pointer... setting the refresh mode, drawing the mouse pointer, resetting the mode, etc. I didn't bother with a custom QWidget/QPainter... the paints were synchronous at that point.
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