I am using user relationships to build a site to work like an 'online exercise book' for students and teachers. A student creates a relationship with the teacher so that the teacher can access and comment on nodes produced by the student. So far everything is great.

Is there a way to automatically turn on 'post to friends' by default when a user creates an account and even disable and hide this option so that every node produced is by default shared with friends?

Also, As I teach around 300 students it would be great if I could move my 'friends' into groups e.g. a group for class x, a group for class y. These groups would just be for my own benefit and should not affect the individual users. Any ideas on how to achieve this?

Thanks again for this great module.