I'm running Sacred with no issues on a 16:10 monitor (under VIsta) . Though, I do have the Nvidia control Panel set to scale to Fixed-Aspect. I'd assume there is a similar one for Radeon Cards.
Hm. Well according to this guy
ATI is supposed to have it, but I've never seen it. I've attached a shot of my CCC.
Um, by chance is it because I have a DVI converter and not a direct DVI connection, or something? (Taking a shot in the dark here.)
A disclaimer in that I'm not too familiar with ATI hardware and CCC. I primarily deal with nVIdia and Intel onboard graphics.
Looking at the details, it appears that the converter may be the issue. Depending on the monitor and how it scales natively (if at all). Without a True DVI connection, you are unlikely to see the options listed you want in CCC.
Things to try:-
1) Check your monitor settings (via the controls on the monitor itself), some widescreen displays have an option to change scaling there based on what signal they get.
2) Any chance you can connect your PC to a DVI monitor with no converter?