[titaniumdecoy]

Thanks, Andrew. I find it strange that Apple makes it so difficult to work with the standard title bar, unless you are using a textured window, which comes with extra baggage (eg, rounded corners). After poking around, it seems to be that the ideal way to go about this would be to use a textured window and somehow straighten out the bottom corners--although I have no idea how to do that.

EDIT: If anyone's interested, I figured out prevent the corners from of a textured window from being rounded: NSWindow has a private method -setBottomCornerRounded:(BOOL)option which can be accessed in an NSWindow subclass.