Thank you for all of the feedback. We are looking into a bigger feature to provide full inspection of the scene graph. The main purpose of this functionality is to use it for UI automation, test frameworks and editor and stand alone tools. As part of this we must also look at the whole get parent and get child/children functionality that the engine provides. It is not unlikely that you will see this functionality available in the engine during Q3.
The reason we have been reluctant to add this kind of functionality is the implication it has on performance. It is not a fast operation and not really something that should be used without caution. In general we don’t want to provide functionality that can be misused and cause performance problems for developers.