i believe the LCD was released in 1999, it did first have the 2 finger trigger at that point, the Angel LED SE was done being manufactered in 2000.....i think......the single finger is an option on both but is usually accompanied with a custom built angel, because of the fact that most people think that a double trigger somehow makes the gun faster.......hmmm.......
Course a double trigger increases rate of fire. It acts as a lever, making the trigger pull lighter, and so easier. The easier a trigger pull is the faster you can fire cos you are putting less energy into each shot, and spreading it over many.