There is no extra package list available for ispconfig 3. The package list is basically the perfect setup guide.
Before I was looking at an older page that made the installation start with ./setup rather than the current php -q install.php. Help would be appreciated otherwise I can always go through the perfect debian installation and write down the packages, but this page was telling me how to change the distribution variables, and I would love to have that again.
You seem to mix up ispconfig 2 (which has a setup shell script) and ispconfig 3 (which has a install.php script) here. ISPConfig 2 and 3 are completely different software packages and have different system requirements.