Grant,
Thanks for taking the time to use the new Analytics beta and send us some feedback! I agree with the need to filter for summative vs. formative.
One of the intentions of the assignment type filters at the bottom of the chart is to allow an instructor to remove the Assignments or Quizzes and just see the "regular" assignments.
Assignment Type filters at bottom of chart:

I want to make sure I'm understanding your scenario correctly. Would removing the Assignments to just see Quizzes using this filter meet your need OR are you saying within the "regular" assignments some are used for summative assessment and you've created specific assignment groups instead of quizzes for this purpose?
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