Sometimes it can get confusing in four deck (particularly in horizontal waveform view) as to what goes to what. What if when you mouseover the play button it visually emphasizes in some way to indicate which waveform and song title would get effected if this were to get pushed.
thank you for your feedback. I forwarded your request internally and we are thankful for pointing this out.
It would be great if other users could push your issue by upvoting your post.