I too wanted to use the plugin today to correct some database errors
Being a programmer (although I only know very little python) I modified your plugin a little to allow database modification. For now I added two buttons "Update author" and "Update title", I cannot be sure if they always work correctly but I used it few times with success. Unfortunately my source site has author as LN FN and I have not resolved how to handle that.
I could upload modified file, but it for sure needs a lot of improvements.