Hi,
It's common practice, when rigging, to change the display of bones to shapes that are representative of their function within the rig. For example, a bone that is used as the target for the eyes to track to is often displayed as a shape similar to a pair of glasses.

The current way to do this is unwieldy and involves manually creating the wire shape and referencing the bone to it. I always find it a pain doing this, often having to use trial and error to get the correct orientation and size for the shape. Also this necessarily entails having a copy of the referenced shape in the scene which is quite untidy.