Dodgint,
Ironically, I remember reporting this to Dev last year. They fixed it but it appears to be slated for the next release instead of anything already out.
The only way I know to do this is manually hacking the existing command. You can find the Right Click menus at Settings > All Settings > Notification Server > Right Click Menu > Actions. There is an "Installed Software Report" setting there that is read-only, but you should be able to right-click and Export it. Then, open the XML file in Wordpad or some other text editor (Notepad doesn't always format the XML properly), and find the <target> tag in it. You should see the actionUrl code indicating what it does, and it will have a Guid=*** field with the Guid to the incorrect report. Just replace the Guid with the one for the report you want to use (make sure it's replaced anywhere in this XML, as mine shows it twice in that line) and save and import this XML back in.
Of course, back up the original XML just in case it doesn't work. :)
-K