Take a look at SQL Server 2008 FineBuild.
The reference manual shows the GUI steps for doing the configuration, and points to the section in the scripts that does the same thing using the command line.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara