[Karellen]

I was re-scraping as I wanted the latest IMDB ratings.

Use this... https://forum.kodi.tv/showthread.php?tid=316342

I think I will have to contact the admin at the moviedb site and fight my corner for my sets to be included.
Have you a contact on this forum?

No, don't bother. They will be deleted as soon as they are found, and they won't allow user sets to be added.

Your other question has been answered. If the developer has any interest, he will post here.

I think you need to change your workflow. In fact, your workflow should be the same as mine.
First you need a portable install of Kodi. One that you can mess around in, and not worry about ruining anything... https://kodi.wiki/view/Portable_mode
You use this portable install to scrape your movies and tv shows. And I expect you only add one or two items at a time, not dozens or hundreds.
Then you export to Separate files.
Open the nfo file, delete all the artwork links. Add your movie sets, and whatever other changes you make.
Use Artwork Dump to download the artwork while scraping... https://forum.kodi.tv/showthread.php?tid=360078
Then scan that in to your main Kodi setup.

or

You could use a media manager to organise your library.