The "Used In" column on the "Configure Aha! scorecards" page ignores conditions where scorecards are used by custom fields. I would expect it to display the name of the product that is inheriting a scorecard via a custom field.
I almost killed a scorecard because I thought it wasn't being used then discovered it was. Phew!
Thank you for the idea. Given the low volume of support for this idea, we do not have plans to make updates in this area at this time.