I want to stay 4:3 by default but have it automatically switch to 16:9 on a few select titles that support widescreen (GoW II). Is there any way to do this?
There is no way to do what you are asking as of now.
But: You know like 95% of games have widescreen patches, don't you?
I don't really like using widescreen patches and such. I like to stay true to the games and use widescreen only if the game supports it natively.