A truly trivial request: When the mouse is over the output window and scrolled with the wheel, the cursor scrolls line to line. The window contents don’t scroll until the cursor reaches the top/bottom of the window. This is, essentially, no different that using the up/down cursor keys to move through the messages.
My personal preference would be for the mouse wheel to scroll the window contents rather than the cursor position. Much more efficient to move through messages more quickly, IMHO.
(Note: The output window should not need to be clicked/active first – if the mouse is over the output window and the wheel scrolled, just scroll the window.)
Just a thought.