[tshering]

@wickyman

You are right, fmon is less invasive. I think there were some problems related to suspend that can be solved by using the start menu. However, I did not follow that discussion in detail . Maybe you better look into the koreader thread, or read the discussions on github. Informations are unfortunately dispersed all over the place.
You could simply try to start koreader via fmon. If it works for you it is ok. If it doesn't, try the start menu. There is not much risk you take. A factory reset will bring you back to a clean device.