The title and author cannot be deselected at the plugin level for any metadata source plugin. They can be deselected in the main metadata download preferences. That might do what you want. I have never experimented with this.
What I do do with when I want to add just an identifier to a book is do the search and copy the link displayed then cancel the search. Then, click on the paste button next to the identifiers field. If the URL is recognised, it will be parsed and added as an identifier. Not all metadata source plugins will do this, but, all the ones I maintain do. This includes Goodreads.
But, for Goodreads, you might be better to use the Goodreads Sync plugin. It has function to get the identifier from Goodreads. You can choose the book from the matches it finds and it lets you choose the edition.
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