Currently, the "Knowledge base lookup" only show 3 articles and the relevancy is decided by multiple factors: article title, subtitle, body, category or subcategory, and tags. This means that the article customers want may not always appear as a result.
I would love to have the functionality to decide what articles show for certain specific keywords (manually). This way, for important keywords, we can ensure that the article will always show.
I like so much your Idea, and to complement, it would be nice to have more than 3 results and also to be customizable the number of results and the criteria for the lookup! I will vote your Idea!