It was a close in booking (day before), so BS or Anytime were my only options, and the split ticket was ~50% costlier. I did explore that option, because clearly if they're booked separately there is no need to abide by the 4-hour rule. It isn't worth the extra dollars to me for the longer stopover, was just seeing if there was some extra flexibility with "segments" on a BS fare. Understanding WN's business model, it makes sense that there isn't. They did draw one soul over (temporarily) with their double points promotion though.