I would like to see an option to turn the smart camera off. This is when you are offscreen or slightly uncentered from your active hero while trying to move using hold-down-MB1, it will force your camera to be on top of your hero. Slightly annoying because I think it's a very fun way of playing the game but I find that seeing a bit more in front of my character would be preferable.
Also, not being to close dialogs with ESC can be annoying since its so intuitive to do so