Apple does not provide any API for getting the state of the modifier keys on iOS. I really think this is something they need to loosen up about if they want people to go into the post-PC. We get the point Apple, you want users to be able to do everything an app offers without accessories. But that's orthogonal to replacing your PC with an iPad.
(Especially since the private APIs are already there, they just need to allow them)
(Especially since the private APIs are already there, they just need to allow them)