I recently reviewed the iOS app on the App Store, making note of drag and drop functionality missing on the iOS version. The devs replied saying drag and drop is not supported in any audiobus apps. Perhaps I misunderstand, but auv3 apps like Suggester offer midi drag and drop from within the auv3 or standalone app to another app, so it appears possible.
I also pointed out that with iOS supporting context menu gestures as well as mouse & keyboard support, it would be useful to allow the same right click functionality that the desktop app offers, as opposed to having users rely on the shift button for actions like deleting a pattern cell.
I hope to see this brilliant app integrate the above someday.