Some more detail about what you want to set would help.
One option is to add additional commands to the "final_fixes" string in the build.configuration file. If you look at the Xfce example, you'll see it starts with
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# Add a desktop icon to run draklive-install.
"mkdir -p /home/$default_user/Desktop",
"cp /usr/share/applications/mageia-draklive-install.desktop /home/$default_user/Desktop/draklive-install.desktop",
"chmod 750 /home/$default_user/Desktop/draklive-install.desktop",
which should give you an idea.
Another, easier, option if you are going to use the Live ISO on a USB stick is to enable persistence on the USB stick. Then any settings you change when you are running the Live system will be remembered.