Instructors should be able to create additional columns in their gradebook for notes or text entry. This helps with communicating to TAs, organizing your gradebook, and keeping track of information that doesn't directly translate into a score. Just one notes column isn't enough for courses that need to track multiple kinds of information.
I know this request has been floating around a while, but I couldn't find an actual idea page for it. Here is a related post I found, though: Cold Storage Feature Request: Gradebook Text Fields