Hi. We don't support auto-rotation and there're no plans to support it.
If somebody wants to step in it would be welcome, but don't expect a trivial task as there're some platform independent code paths involved that you'll need to tweak.
The entry point that forces no autorotation is in
https://github.com/koreader/android-...nifest.xml#L42. Removing that line will allow you to autorotate, in theory. Then you'll need to go-catch the aforementioned code paths
Hope it helps