ExtremeTech have written an article about adjusting Knoppix to fit individual needs.
They have the guide for you
A bootable disk with Knoppix can be a lifesaver when your computer goes awry. In this feature, we show you how to change Knoppix to fit your needs. Also, check out our other features on Knoppix, such as Fixing Windows with Knoppix and Fixing Linux with Knoppix. These are from the ExtremeTech book Hacking Knoppix.