Shift+Backspace = server exit?

[Ian Romanick]

I asked about this yesterday on #freedesktop, but nobody had any ideas. 
  I searched around in the tree, and I found nothing useful.  Here's my 
situation:

I have two systems that were loaded with XFree86 4.3.x based X-servers. 
  One was Fedora Core 1 and the other was SuSE 9.1.  I built X.org on 
each of them from CVS and installed.  When I did that, two, probably 
related, things started happening.  First, the X-server terminates with 
Shift+Backspace in addition to the usual Ctrl+Alt+Backspace. 
Additionally, Ctrl+Alt+Fn# no longer switches to another VT. 
"DontVTSwitch" is not set if my xorg.conf.

Both of these "features" are driving my nuts!  Several times a day I 
will accidentally hit Shift+Backspace while editing driver code.  I'm 
just really, really glad my text editor automatically saves for me every 
couple seconds.  I'd probably have smashed something by now if it didn't. ;)

Suggestions?