Automatically graded extra credit on tests for 500 students

Community Member

I teach two sections with 250 students each. I would like to offer them extra credit on their tests, as the main credit questions are quite tough and I expect the median grade to be below a C. It seems as if the designers of Canvas have never been teachers or students, as extra credit is a normal sort of thing in most classes I have ever taken and every course I have ever taught. With 500 students, manually grading questions or even entering 500 scores in a reasonable time is untenable and with well designed software should be entirely unnecessary. 

Is there an undocumented solution, trick, or hack out there somewhere? Has anyone at Instructure noted that Blackboard is vastly superior in the practically seamless execution of such a simple feature?