I'm not sure if anyone else has posted a similar wish list item, but I thought of this today and wanted to see if there was anyone else who would find this idea helpful:
Similar to Maya and 3D Max - I wish there were an outliner for element creation in the conceptual mass environment that allowed you to track hosting relationships among elements. This would be particularly useful for Reference Points hosted to Reference Lines as well as other reference points to see the relationships such as whether they are hosted from the beginning of the line or which plane of the reference point they are being hosted to. There doesn't seem to be a very clear way to understand this currently and can make for some confusing situations when trying to create parameter for offsets and normalized curves.
It would be a great thing to start seeing in Revit since conceptual massing for me is becoming a more and more valuable platform for creating and documenting complex geometry.