You should be able to to run code downloaded as part of IAP also. But this is one of the major things I wish they would change, and also one of the major reasons I'll be switching to Android.
Which is what I meant by "within the bundle of your app." That may have been a bit too iOS developer-centric, I apologize.
In Foundation, [NSBundle mainBundle] returns a reference to an object representing your application's root directory, and the code and resources found within. Roughly the same bits that you'd find within an unpacked IAP file.
