[rkomar]

The best way to "fix" this is to make koreader save the cover itself to the correct file location. Then the device will display it when it powers down. If you want to pass the information on to the koreader developers, you can tell them to draw the cover image to the screen buffer (without updating the screen if it isn't desired), and then call:

#define DEFCOVERSAVEPATH USERLOGOPATH "/bookcover"
SaveBitmap(DEFCOVERSAVEPATH, BitmapFromScreen(0,0, ScreenWidth(), ScreenHeight()));

Edit: Okay, I see from the linked thread that the real problem is that none of the koreader developers have PocketBook devices, so they aren't interested in making the changes. They have all of the information they need already, so my advice above is useless.