In the grading window I wish there was an "I" for "incomplete" option when grading student work. I don't like giving students a zero or a minimal score when they have turned in work. I would love for an "incomplete" grade to allow students to go back into assessment-type assignments without having to do a retry, which wipes out all the work they have done before on the assessment. I recognize that many would not like this feature with assessments, but you could toggle it on and off in the settings. I would like this feature for other assignments as well, as I think it would alert students to the need to finish something without seeing a poor grade. It could also be helpful on discussion assignments as students frequently neglect to comment on others work after they submit their own.