I think we are speaking about two different things. There is a problem with joystick/analog stick calibration/deadzone in general with recalbox.
At the moment I am able to drive 'assetto corsa' on PC with my xbox360 pad quite well (steering help etc. turned off of course).
In Recalbox I am not even able to play Mariokart 64 mit analog stick since the deadzone/calibration issue.