When a student submits a writing assignment, it would be really nice to be able to attach a note to whatever it is you highlighted. Since notations are now included on the right hand side, it would be be so helpful to attach a note to that notation rather than having two separate steps.
For instance, if a student needs to capitalize a letter, I could highlight the letter and then attached to that would be a notation saying, "Please capitalize."
Another feature that would be nice is with the draw feature. There are times where I try to circle something and it's so distorted I end up deleting it. It would be awesome if it would automatically correct it into a circle.