That sounds a lot easier than my hack.
I was considering using a batch file to launch the applications. The batch file would open another file, add 1 to the proper software category (i.e. Word 2007 would get +1, or Excel 2007), then have the batch file launch the application. I would change all the shortcuts on the desktop to do this, and change their icons to be the same as the usual ones.
This wouldn't help when a user took their own removable storage and launched the application by double clicking on a file.
Question for you - do you use Windows Steady State in that lab? Or something else? Nothing?