it is trivial to change the owner of a node from anonymonk to a registered user - provided you have appropriate permissions to edit the node.

I suspect the most elegant implementation of what you suggest would be to empower the janitors to do this and anyone could request that a node owner be changed from anonymonk by /msg'ing them

I am not sure how to overcome the obvious issues of verifying the authenticity of the claim of ownership of a node and/or the issue of someone eventually trying to abuse this process for such things as reputation gain.

Absent a solution for those probs - I doubt anything like this would ever see the light of day.