This is potentially very useful to schools who wish to collaborate with other schools. But students need to be 'contained' within one Google Wave with a defined 'team' working on for example a citizenship project on fair trade etc, rather than be free to start new Waves on the subject of say Zak Effron or start messaging their friends... can you have an owner defined Wave ie by the teacher and partipants ie students permissioned to access only that one Wave.