The normal metadata download plugins, at least those included in my install, only search sources for ordinary books. You'd need to create your own metadata download plugin for that, I believe.
Also, the ISBN field turns red when you enter anything that is not a valid ISBN. I don't think that it refuses to save the value, though, so you should still be able to enter and save the DOI in that field- however, don't expect any results using the normal metadata download plugins- see above. If you were to create your own plugin, a custom column for the DOI might be a good idea for the sake of being tidy.
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