It looks like you can directly replace the splashscreen graphic in xcode 4's iphone splash screen editor. Does this mean that iOS Free/Basic users can avoid having the Unity splash screen showing each time?
Haha, I guess you could do this, but it is undoubtedly a breach of the license for iOS free/basic. It's "you can do this" in the sense that you could also rob a gas station, but that doesn't mean its legal or that others (aka Unity) will allow you to get away with it.
If you replace it, your apps crashes. I have tried before I knew that it was a Unity Free limitation.