After reading this thread, I thought it would be a good idea to add the two windows for off-hand. Currently the offhand data reads awkwardly in the scroll box.
You could make the primary window slightly smaller, then add a much smaller window in the corner of the larger one, for the off-hand damage/THAC0. This would help differentiate the primary/secondary hands. I would expect changes like this should not be considered a priority, but I would like it to at least be considered.