live usb straight to desktop

[Ariszló]

Booting Ubuntu from a live usb stick, how do you skip language
selection and the screen that asks you whether you want to try Ubuntu
or install it?

Is there a config file to edit that allows you to boot straight into
Unity live session using your preferred language and keyboard layout?

I have asked this at http://ubuntuforums.org/showthread.php?t=1746638
but the forum has so high traffic that it is unlikely that the topic
will be noticed.