It would be helpful if an advisor or teacher of a student could communicate with all "teachers of" that student.  Especially if something is going on with a particular student (divorce, death in the family, academic struggles, bullying, etc).  It could easily be added under the progress view for a student.  On the flip side, as suggested by David Andrews (Title "All teacher message button"), it would also be helpful for a parent to communicate with all the teachers of their child (see reasons above).

This should include the currently available bulk communication option of sending via email.  Also, it should update based on term(s) selected.