I hope it fixes dual layer support too, oh and I also hope it fixes whatever was causing superdump to mess up with it that was changed from 13b.
Other than that, the cIOS covers everything I want it to do. But fixing of copy protection in the IOS is always good, although I can usually fix things with a hex editor or patch whenever such a thing is required. That or get an updated loader(s) as loaders are often far ahead of the cIOS when it comes to handling copy protection. (Neogamma for instance. It beats everything I know to the punch as far as getting a new game to run is concerned.)