I think it is critical that an instructor upload version be provided for grading important paper exams. The instructor would upload a PDF with batches of exams. Based upon a template, the batched PDF would be split into submissions. Then each submission would be sorted to the appropriate students and go through the grading process.

This would be useful in cases where students don't have easy access to iPads/styli. Or, where teachers are giving paper exams and don't want students to handle the submission process.