I personally don't use multiple back or cameras for different development. I had a college professor that carried 3 camera bodies one for N, N+1, N-1. I Felt he was a slave to technique. We all work differently. What I do is always expose for shadows and develop normally or for "N" for mixed lighting condition on a roll. I can always adjust the contrast by changing the grade of paper. There are exceptions of course. I pull back development about 10-20% if the whole roll is shot under contrasty scenes and add 10-20% development if the whole roll is shot under low contrast. I do admire old timers being to shoot and process film and print on grade 2 paper.