One of my users has corrupted most of their smart groups by manually adding & deleting contacts. Talking to the user, she was not aware of what was a smart group and what was a regular group. in fact, in normal use there is no visual difference (unless I'm missing something). However, in 'contacts/manage groups' menu option it is clearly displayed but not otherwise. Clearly indicating that a group is smart would avoid this problem - use a different colour? I have noticed other questions about smart groups that indicate corruption caused by users manually adding contacts. Do other users think this would be worthwhile?