Hi Eric,
You would have to write some custom code in your s_code file that aborts the request.
You would also need to access some flag from javascript that distinguishes the scanner from a real visitor. I'm not sure if you can configure your scanner tool to set any cookies or make any data available to the javascript context. If you can, then it would work like this:
Probably in doPlugins, you would write some condition:
if (/* cookie is set, or javascript that distinguishes your scanner is true */) { s.abort = true; }
Thanks,
Ben