Many companies have formalized limits for pilots when it becomes mandatory to stop pushing and go around. Am I wrong to suppose SWA has those too, namely after skidding over at Burbank twice? That's a lot of practical experience.
The other thing that springs to mind, long lost information from the ATPL books, is that LLZ 1 dot deviation at RWY THR marks the physical runway edges. Thus LOC antenna placement (in terms of distance behind the THR) is defined by the spread angle and the sideline anchor points for 1 dot at THR.
Any armchair investigator can take Google maps now (or AIP data from US equivalent), locate the antenna and draw the protection area of 1 dot LLZ. In general I believe, again - ready to be re-educated -, 1 dot LLZ marks the acceptable range of being "on course" i.e. within the qualified lateral protection zone to follow the GP.