I see Michelle responded on a different thread. I would concur with her that this unit wasn’t designed to go in depth on App Lab. It is more of a unit where students are encouraged to develop empathy for the needs of other users and to continue developing their abilities in problem solving. I, too, have students want to do more than the unit teaches, but I always tell them to be patient and that they will be able to learn more and do more in unit 6.
If you have time after unit 6 and want to come back to student projects in this unit, I am guessing students will have more of an idea of what they can do and could improve their prototype apps.
Mike