The Insert in Route function is present and correct on both platforms, so I'm afraid I don't understand your question. Perhaps you could give us precise steps to reproduce the issue, including setting up the exact route you've got and what waypoint you're trying to insert.

If I am in flying mode and want to insert a user waypoint to the current route - tap and choose Insert - I can do so on my iPhone, but cannot on the iPad? Both running latest version of the software and iOS802.