I found out that the settings are made in the file

/etc/X11/Xsessoin.d/45xsession

now I know how i can change things, but how can I make this change happen?
Is it possible to run a script (which i can put onto my usbkey) by cheatcode?
Or is it possible to change the 45xession file inside the compressed KNOPPIX file somehow???

Greeting
Seballa