Indirect / calculated properties (for queries)

It would really powerful to have the following:

• automatic, read-only property "Referenced objects", that would show all @ referenced objects from the current object (from text properties), similarly as we have "Backlink objects" property
• "lookup" property type, which shows a specific property of an object linked through another property, e.g. if a Task has a Project property, it should be able to show the Client of the Project, so tasks could be queried by client.