This idea has been developed and deployed to Canvas
Sometimes rubrics (we refer to them as Scoring Guides) have lines of text with no point value associated with it. It's purely "information only", and it does not require a score (highlighted below). In order to work around this, we have to have two "zero" scores in there. It would be helpful to have an option to create an "informational" row where no points (including zero) have to be displayed.
Use case: We sometimes have Scoring Guides with several rows of criteria which contain values of "Met" and "Not Met" instead of point values. These are more of a "check-off" for each criteria, and therefore no points should be assigned for that row.
As a side note, when you use a rubric in the SpeedGrader to grade a criteria that has two "zero" scores, both get highlighted in green even if you click on just one of them.