The ability to be able to restart the machine during the installation process (already possible i know) and have WPI automatically resume where it left off. I know if you open WPI again after a restart where all the programs were not installed, it asks you if you would like to continue, but if your trying to do the install automatically this doesnt work, as you have to monitor the progress and manually open WPI again to continue. I know you probably dont need this often, but i came across a problem when trying to install Windows Defender. It requires Windows Installer 3.1 to be installed, and the machine didnt have it. Configured WPI to install Windows Installer, but it likes to restart after installation... so you have to manually restart WPI after the machine restarts... thanks! BTW, absolutely fantastic software!