Problem: the data for books and papers in the citing tool has to be introduced every single time the book is used. Even though you have now a drop down that lets you choose information you have introduced once before, you still have to remember the beginning of the element (ex. ISBN) to be able to choose in the drop down.
Proposed solution: linking the citation with a Wikidata element would, by choosing the Q number of the book/paper (ex. wikidata:Q208002) or the title, allow you to fill out all the elements in the citation (if the element already exists in Wikidata).
Who would benefit: everyone using citations of books and papers repeatedly.
More comments: This would also encourage the creation of the books/papers used as citations in Wikidata.
