KW Density Check (for lack of a better phrase)
When working with a large team of editors, we give directives on how to better optimize for various queries, whether new or those which are in striking distance for top positions.
Being able to search for a term and get # of times it's been included in a page (and where; e.g. body copy, alt text, etc.) would be incredible when spot checking editorial work.
Ability to get all URLs crawled/audited that include a term, along with count and location, would also be amazing.