A number of experimental features are available within iRis. These features are listed as experimental as they have not been widely tested and are likely to go through a number of iterations before they become stable features.
All experimental features can be enabled or disabled through the iRis section of the iPhone / iPod Touch Settings app.
Feedback on these experimental features is greatly appreciated. There are discussion threads on each of the feature pages or use the 'Email Support' links on this site.