In workshop, teacher can't provide additional assessment during the grading evaluation phase

While evaluating grades, the teacher may often want to provide additional assessment. The common case is when peer-assessments vary a lot or the workshop itself is unable to decide the "best" assessment - such a situation is described at http://docs.moodle.org/23/en/Using_Workshop#Grade_for_assessment

To do so, the teacher has to switch to the assessment phase, provide the assessment and then switch back. This is not only annoying for the teacher. It can be also confusing for students and under certain situations, may even lead to an unwanted situation that a student gets an opportunity to assess something after the expected date/time.