So I take it your monitering bandwidth? If so why not force an include on all asp files and a javascript on .htm and .html files that moniters it i.e.
Your clients content here
<!--#include file="script/bandwidth.asp"-->
or
Your clients content here
<Script language="javascript" src="scripts/htmlbandwidth.asp"></script>
Just force it on Upload and edit. Obviously that wouldnt help with images and flash etc. but I am sure there is a compenent lurking somewhere for monitering bandwidth in directorys using IIS.
Not sure if I helped hope i did, Martin.