I've seen that it is possible to tag several people in a picture. I'd appreciate a similar feature in notes and events (or perhaps a possibility to add notes and events in bulk to several people).
For instance, if a family with seven children moves, it is slightly tedious to add the move and the new address to all nine people individually. It would be easier to add the event once and then tagging all the people involved.
It would also be interresting to tag people as godparents, groomsmen and bridesmaids etc, or who was a beneficiary in a will. And also who worked as colleauges, were neighbours etc.