In my opinion the chat window is too small. Other thing that you might ask your friend if he rather uses the mouse or keyboard. When he says keyboard, I would add the actually Keys to target some player or use a hotkey. I found various postings from priests that do use keyboard to cheer at that.
Personal I am doing 95% with the mouse. My skin in the class->priest section was optimised to that, but doesn't look nearly as good
. Basically I wouldn't use yours with a mouse, because things are too much scattered around.
Last thing I would try to consider is to go to a higher resultion, but reduced viewport. So you can add more information without loosing the view