Simplify! Please ask teachers what they want and need, like have several teachers (especially primary/elementary teachers) help out with the interface.
-I still want to see my class when I am screen sharing!
-Camera tracking is distracting for already distracted learners. When I hold up letter cards the camera moves away to find my face.
-halo/highlight who is talking. It is hard to find who is talking in large gallery mode or when screen sharing. a simple halo around their box makes it easier to see who is talking for the whole class.
-get rid of all the bells and whistles that slow teams down.