Anoying new X behavior

[stan]

I have noticed tat the control alt backspace key sequence no longer kills X,
in newer versions of Ubuntu. How can I recover this functionality?

Also, when logged in to a virtual terminal session, when you exit it the
machine jumps back to the X session, rather than simply presenting you with
a login prompt on the virtual terminal you had explicitly switched too. Can
I fix this "bug" somehow?

-- 
One of the main causes of the fall of the roman empire was that, lacking
zero, they had no way to indicate successful termination of their C
programs.