Web Security is done with the HTTP proxy, so that report will continue to be blank if you aren't using the proxy. If you wanted to run the proxy in a transparent mode, you could put the IPs of the programmers' computers into the 'Transparent mode skiplist' and continue to allow their web access via packet filter rules. Their access then would not be trackable, but everyone else's would be.
Web Security is done with the HTTP proxy, so that report will continue to be blank if you aren't using the proxy. If you wanted to run the proxy in a transparent mode, you could put the IPs of the programmers' computers into the 'Transparent mode skiplist' and continue to allow their web access via packet filter rules. Their access then would not be trackable, but everyone else's would be.