I think it all depends on whether or not you can figure out a way to parse .META files. You can programatically list all documents hosted on the QVS (see http://community.qlik.com/forums/t/24414.aspx). You can then get their corresponding .META files (which will have the same name + .META). If you open these files in Notepad you'll see that the full list of users is in there, but in a difficult format to parse. However, if you can figure it out, it should be relatively easy to write a function that outputs filename/users to a CSV, which you can then feed into a QVW.