@twowheels The KPVBooklet has a more seamless way to integrate Koreader into the native system, that's to say tapping on the EPUB title on the homescreen will open that document with Koreader just like the native MOBI reader opening a mobi document. It does it not by mimicking the native MOBI reader with an active app but by really registering Koreader as an EPUB document handler. Source code of KPVBooklet can be found
here. And there is also a screenshot of the homescreen on KPW with KPVBooklet
here.