OK, just to confirm the handling of editing multiple tracks (outside of M/S):
I have a stereo track and 2 mono tracks– from a stereo pair of mics + 2 spots.
Typically, one would editing them all together, but need to process separately.
In order to trim them together, clips in each track must be grouped, or each must be selected & trimmed with opt key.
Shift+click does not work for selecting clips over multiple tracks.
When all clips are not selected, the selected tracks trim– the others either do nothing, or move & overlap if ripple all tracks is on.
When splitting clips, the behavior is different: Selecting just 1 clip can split all, if that command is used.
I’m just finding this quite clunky right now, so thanks for the clarifications.