Wouldn't it be great if you could adjust vol/pan/delay/any values in the editor by click-dragging?
You could have a modifier, e.g. command + click, which upon dragging adjusts the values to taste. This is a dynamic way of adjust values to perfectly suit your song.
(it's kind of similar to how there is slide functionality for value adjustments in the phrase editor - that alone would be very handy in the main pattern editor, not sure why it isn't included there)