A good thing with the old channel layouts was that you could change the shape of the channels after you had put them out on the layout.
What I have found with the new MS is that you have to delete the old channel and put in an new one, turn it and re-size it.
Would be good to have a way to swap. Maybe a swap tool where you pick a shape and then klick the ones you want to change? Or select all and just klick the new shape.