I have been working on version 1.2 of my BTEC grading plugin that should display better in the Moodle 3.1 grading interface (it still works fine with Moodle 2.9 and 3.0 . I have moved the radio buttons to the left hand side and added a set of buttons at the top to toggle all on and off. Please install on a test system and post any feedback. You can find the code here.
https://github.com/marcusgreen/moodle-gradingform_btec/tree/btec_1.2