Citoid should have a 'Wikidata ID' parameter.
When a Wikidata QID (example: Q30000000) is entered, it should fill out the chosen citation template, using values from Wikidata, using the Wikidata translator ( https://github.com/zotero/translators/blob/master/Wikidata.js ), just as it currently does if a Wikidata item URL (example: https://www.wikidata.org/wiki/Q30000000 ) is entered in the URL field.