David, your book is just awesome, got it paper and kindle edition always with me. Really love how you developed it!
More ore less the steps you are doing are the same I do, the only difference is that I can share the decoder on the Aux (so more M/S tracks can have same processing) and in this current project it comes in handy, but I will keep your suggestion since can be really helpful in other part of the project.
This thing I cannot understand is why is it so hard in Logic, the only software that comes with M/S decoder!!!!!!
in Reaper/Protools is just
1 - create stereo track
2 - set input to M/S mic (where I added this alias like I/O labels, but I can create path and combination in them, logic keeps it locked to the 1-2 ...)
the M/S mic is mapped as L <- Input 2 R <- Input 7
pretty simple