I am a heavy user n the sense I use it every day. I do most of my sermon preparations on it, except my final drafts, because I want the precision of a keyboard for typing. Even then, I have Accordance open on both my iPad and my Mac. I this the Strong's use is actually EASIER on the iOS app, as it is a simple long press.
I wish there was a true Greek-English interlinear. I am not a Greek scholar, and therefore do not have the full Greek modules. But the Strong's has the limitation of not conjugating the words. I use my KJV-Steven's (with Elzevir's renderings) printed interlinear as a resource because of this. If I could get that on my iPad, it would be great for the times I travel.
I also would like the capability to create an alternating line interlinear with any two versions. I also use my Spanish text alongside my English KJV, but having them in two panels isn't nearly as helpful. However, if the app allowed users to create an alternating line interlinear, I would buy the Greek texts.
I also have a wish that isn't iOS specific: The works of B. H. Carroll. He was a great Man of God, and a prominent theologian in his day. Some of his works are even public domain (i.e. A Study on Romans).