3rd Cross bar set?

[Psyence69]

From what I understand, this isn't possible because L2 and R2 are essentially one button; the L2 trigger inputs a positive z-axis value, while R2 inputs a negative z-axis value. So pushing both at the same time results in a cancellation (-100 + 100 = 0), which is the same as not pressing them at all.

Are you saying the Call of Duty style "LT to aim down sight and RT to shoot" input is impossible?