Self Service, progress indicator, and user impatience

Have had multiple instances of users failing to give SS enough time to download and install apps, whether they be from a direct download package or VPP. It seems that the progress indicator is not tied to the actual progress of the installation, so in most cases it will say "Done" even when it's not. They click multiple times, see an error, and then send us a ticket that it's "not working". I've considered some sort of pop-up that tells them to be patient and even monitor the app icon in the Applications folder, wondering if anyone has any sort of method they're using that might be more precise. Like a pop-up when it starts and another when it's actually complete. I realize this might not be possible within a VPP-based profile, maybe that's reason enough to go the direct download path via script...