An upgrade for the bank would be neat too for player that want to take a more passive approach to the game so that you could just continue to reinvest money once you gain a little to invest in the first place. This would take longer than an active playing of the game but i found my favorite part was that i could do schoolwork while "playing" and wished the bank would do a little more to accommodate my play style. Perhaps Local branch > National bank > Corporate Bank > Pingy bank?
A sprint button with like a double arrow click or something would be wicked awesome... like nothin crazy but just a little boost when backtracking across a level
:)