Very good find. Ive been using a setup kind of like this in the corner when you end a combo in foreword 3 after using the first one to start or in the middle of the combo you can dash through them to cross them up with the dash in the corner, still leaving u with the same options. timing for it can be a little weird. You have to hold up(jump) during the second forward 3 to setup the timing for the dash, or you can just dash 3 times and the 3rd dash crosses up. using the jump timed setup leaves a guessing game with the jump timing because if you just hit up by not doing it right after the second foreword 3 you will stay same side.
Edit: the setup works in the corner and right outside of the corner (near corner) but outside of the corner you only get the 3 dash crossup