I could not reproduce any issue when testing on iOS 6, but it doesn't seem like it matters much, since everyone will be on iOS 7 soon enough anyway.
The events you posted don't look reliable - it looks like it'll break the landscape fullscreen mode, and it will be brittle (since it depends on hard-coded numbers which could easily change in later releases). So we wouldn't want to build something like that in to the engine, although you can try to hack something like that with events if you want.
I would reiterate this is a problem with Safari on iOS 7 - anything that runs in the browser will be affected, not just Construct 2 games.