Usually both my outside lines have no weight so interchangeable. The third line in has a hot/n/tot.....this line gets moved to dipsy rod holder while I reset the line that just got bit. Between the downrigger line, the flat line out the side, and the chute 1.5 color I only run three board lines per side based on a three person 9-rod spread. If I was running a charter with tons of rods......yes I would do as you suggested to have everything interchangeable.