Hold History report where you could enter a Bibliographic Record ID
If Simply Reports had a Hold History report, where you could enter a Bibliographic Record ID and then see the history of hold requests created for that bibliographic record -- it would be most helpful when trying to see why an item wasn't automatically renewed, or was blocked from renewing.

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Emma Olmstead-Rumsey commented
This is one of the most commonly-requested things by front-line staff for our system admins to run SQL queries for. Staff being able to do this themselves would definitely save us time, and it would provide better customer service by resolving the issues that generate these questions more quickly.