In my opinion castor will affect driving characteristics more than giving or taking an 1/8" of toe.
I dont care for fast food alignment tire shops most the time they just put the adjustment in the green and dont understand what the adjustments are doing to on rd characteristics.
1/8" 1/4" are just numbers one is as good as the other. Chalking tires will pick right up on wear patterns alignment may or may not be a one shot deal depending on wear and sloppiness of components.
On factory steering I like alittle toe in to ensure sloppy steering does not toe out as suspension cycles.
I do like zero toe best but the steering geometry doesnt allow it nor does wore out parts.