Identifier properties are links to databases that mention data related to a given item, they are also often used as references (aka sources), see for example
here. We need a gadget to easily use those databases as references. One possible solution would be to extend DuplicateReferences gadget to allow copying Identifier properties as references to be pasted to other properties.
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Magnus has written a script that uses Mix'n'match for reference adding: d:User:Magnus Manske/mixnmatch gadget.js. Data on Mix'n'match sometimes differs and it does not have all IDs (e.g. large catalogues) in stock, but fulfills part of what was requested here I think.