A feature I think is lacking and that I think would be very useful is to login to your account through a web GUI so you can monitor and control your accounts on a larger screen and with rich vibrant User Interface.
Few other considerations:
Multi user environment so more than one email can be registered to one account. (for example partners or family account where children can have restricted access only to their pocket money account for example)
Within the app there could be a messaging service where you can discuss bills and tag and comment on various things securely.
Generate downloadable reports from the web GUI to pdf or Excel format
Plot out future net worth and saving goals using past data and future commitments, assumptions and manual form filling.
Create future goals and use computer learning to suggest how to achieve goals.