Two ideas that I have seen on another mud client and liked:
When scrolling up have it so it splits the window, keeping the current information on the bottom while the top section shows what you are scrolling through. The bar that separates it would be nice if it was adjustable as well.
When browsing the 'typed history' don't log or keep repeat things, such as if while I am in a fight I 'use scythe swipe at monster' 5 times in a row, have it show it only once in the history.