Jacob, I had a long reply sorted out but I nuked it...too many words anyway.
on lifts, zerchers, band pulls, box squats with chains etc...are all great but honestly, I like them becuase i'm good at them. If I really wanted to drive my zercher, i'd do front squats and if i really want to drive my DL, I do rdl's, if I want my log or axle press to go up I do push presses and incline bench. I think for me, simple is better.
doing SM, Highland games and PL etc looks like it's getting really complicated, I think maybe the right appraoch is whatever volume and instensity can be managed so that the barbell totally supports the event work....for me, sadly, that means taking weight off the bar and hitting reps.