Need Traffic meter to have a per device breakdown

In order to get faster speeds we finally switched to Cable from DSL.

Now we have to deal with data caps.  I suspect I have a naughty device in my network, but so far I have not been able to track it down.

Netgear - Please, add in the needed programming and data capture so we can expand the Traffic Meter to a per device breakdown.

The Router has access to the data, we just need the it to be saved and the interface to see it.