[DanCooper]

Using last commit build. EMM can not sync the user rating set in Kodi to NFO. Instead, the sync feature erase the existent user rating in Kodi for the selected movie. Exception: it doesn't touch it if the <userrating> is already set in the NFO.

Yes, that's true. Sync will always overwrite the data in Kodi with the state that has been set in Ember. Otherwise it will not be possible to change states like "playcount/watched state" or "userrating" in Ember. To read the "watched state" from Kodi you've to use the function "Get Watched State" via context or Tools menu.

I will improve that function to also read the user rating from Kodi. But it's needed to run that manually or set it to "get auto" while scraping or before edit.