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for each of of the Gradebook spreadhseet downloads (Roster, Course Grade views). These configurations can only be set on a per installation basis via a properties file. There will be no user interface.
The availability of the new Course Management API in the Sakai 2.4 release will provide a richer set of data that can be leveraged in the Gradebook. These data may not necesarily be exposed in the UI. For example, the grading status of a student (letter grade, credit/no credit) is not currently a vsible field in the gradebook UI, yet this may be a piece of information needed in as part of a Course Grade download.