scook
you could try copying the new tungsten into the old user theme folder (make sure to change the extension to .sth), open it in the old theme editor and import the changes from "Mercsten" or "Tuncury", save and copy the new theme to the new user theme folder.
That's way too much effort. There will be loads of differences (besides the PRV background) between the stock tungsten and mercsten/tuncury
Need to wait for the new theme editor
I think I'll just do this. ;)
So, when we click "edit" in preferences - by where we choose themes, that opens the "old" theme editor?