Info needed SKID STEERING / RADIO CALIBRATION catamaran

Hello
I finaly succes something, but wandering if everything will go right in AUTO MODE

My config

3DR PX4
Sabertooth dual 12A motor driver for R/C in Mixed mode

I was suposed to to use the exit 3 and 4 from the PX4, throtle and ruder

but only throtle was working was not able to turn

I succes when used the exit 1 of PX4 to turn

everthing is ok on manual

So
Px4 exit 4 (throtle) on the radio calibration, i think it is on Channel 3 throtle
Px4 exit 1 (turn) on the radio calibration : it is on Roll

My question is

Does the auto pilot will use the Roll to turn ?? when you use ardurover

I cannot fully test this , my frame is not fully terminated, it is in fact a boat catamaran twin engine

thank you for your answer
hope everything is clear , on my description

@phmadeira,
The aileron (roll) joystick will normally turn the vehicle when using the ArduRover2 code as long as you are using the Sabertooth ESC in the mixing mode.
The elevator (pitch) joystick will normally make the vehicle go forwards and backwards.
Regards,
TCIII ArduRover2 Developer