there are a few commercial tools that integrate with Moodle that provide a nicer grading interface like Turnitin's grademark that you might want to look at - I also saw an Edword demo last year and that looked quite nice but I'm not sure if they have a moodle integration yet.
I put together a development plan to improve Moodle's annotation/grading interface recently - you can read about it here:
https://moodle.org/mod/forum/discuss.php?d=422700
but - there's a decent chunk of work to implement those improvements and it needs someone to fund the actual development - hopefully it might happen one day
I put together a development plan to improve Moodle's annotation/grading interface recently - you can read about it here:
https://moodle.org/mod/forum/discuss.php?d=422700
but - there's a decent chunk of work to implement those improvements and it needs someone to fund the actual development - hopefully it might happen one day