A good idea to implement:
Deleting an item from the inside of an attached object's contents will move the deleted item into the avatar's trash can.
This would be a good idea concidering how I am starting to use animations inside animation-override objects, and when I accidently delete a No-Copy animation from the contents, its gone for ever.
I bet people here will be able to think of other cases where this kind of a feature would be a life saver.