Delve item picks:
My group's transitioned entirely to playing RtL. As such, we have our shop decks alphabetized, for easy lookup in the shop when we are playing RtL. It's pretty annoying that we have to shuffle it to play the Delve, then re-alphabetize it when we go back to playing a long campaign series.
Monster placements:
Why not always tell us exactly where every monster goes? It does this sometimes, so we know it has the code. It has the knowledge of what our group size is, so it knows how many monsters to create. Don't make us decide where to place them and try to 'ignore' our own biases of where we'd like them to be. It cheapens the feeling of us going up against the app.
Monster actions:
They leave way too much ambiguity as to who they are attacking/engaging/etc. There should be a lot more "the player with the most/least health/damage/X-stat/etc" to reduce the number of times we have to pick for them.