I think a great feature would be to expand upon the linking options for iOS. For example, allow us to link our New Testament English Bible text to our Greek New Testament and our Old Testament English Bible text to our Hebrew Bibles. This is not as big of an issue on PC or Mac versions of Accordance as you can switch easily between windows and have multiple windows linked to your English Bible text, but the process of switching windows on iOS can be a little tedious (especially if you're flipping back and forth between OT and NT cross-references).
To explain this by way of example, I have attached an image of a New Testament text with the Greek New Testament linked in the lower window. When I switch to an Old Testament passage in the English Text, it would be very convenient to have the Hebrew Bible automatically open in the lower window instead of having to manually switch it out.