It would be a great timesaver for writing instructors and anyone else making many of the same comments to students on assignments to save and store comments in SpeedGrader/Crocodoc DocViewer as one is able to do in Turnitin's Grademark feature. This feature would help SpeedGrader really live up to its name, too.
This has been a request since August 2012: Ability to Save and Copy from Frequently Used Comments in Crocodoc : Help Center