I think that CST is there.  IIRC if you scroll down far enough - there
at the bottom of the list - you get all the time zones.
Or just go w/ Chicago...

> Does anyone know where your time zone is stored? 
> 
> I'm running MDK 8.1 and I can't believe how terrible the interface for
> 
> setting your time zone is in KDE. Instead of listing the 4 time zones
> in the 
> U.S., they list about 50 different cities. Simple enough if you're in
> EST or 
> PST (choose NY or LA), but trying to guess what cities they included
> for CST 
> (apparently not Minneapolis) is just rediculous. Argh.
> 
sim