It'd be nice to be able to scroll through the chat, either via hovering and using the scroll wheel, or physical scroll buttons. Oftentimes, I zone out what's happening in the chat window when I'm in the heat of things only to realize that someone was trying to tell me something.
Also, the choice of font sizes would be nice too. I play on a large monitor and don't need such text. It's rather distracting to be attacking from the top and can't see what's coming up due to the wall of text that's blocking my view.