you don't need that button. whichever car i have used with these EDC system (including my current kw ddc - which will be swapped soon ) it felt like only good mode is sport. comfort is bouncy and sport plus rebound too stiff, compression too soft. so always I ended up using sport no matter which condition, car and suspension. (bmws,porsche,mercs)
if you set stiffer low speed and mid stif high speed.
Problem about sway bars, monoballs and rear toe/tractions arms is that you just start to throw random stiffness to the places and I personally could not find a balance and took them off. in one setup i achieved great rear traction however it felt like when it goes out of control, it will go off properly. Then I decided not to throw random stuff and invest in proper coilovers.