lookup request logging

We set up a local instance of OSM following the Wiki instructions and are successfully using it to reverse geo-code; we would love to contribute to OSM's data but cant tell if it is possible to log the requests for reverse lookup that fail to produce a full address on our local server.

Does such a function/log exist in Nominatim or would the only option be to develop it in our application? we intend to have an employee review such requests and update them on OSM.org so that our server will get the additions through osmosis.

Thanks for any help or direction that you can provide.