I've tried the "map to same axis/50% threshold/invert one axis" solution and it seems to work, but unfortunately when I use it for my G27 pedals alongside my Saitek X52 throttle and stick, it clashes: the JOY_Y reported by the accelerator on the G27 pedals reports the same as the JOY_Y on the Saitek, meaning that whenever I press the pedal, in game the control stick gets pulled and stays pulled (!) until I use the real-world joystick -- and if I use both simultaneously they fight like roosters, with the stick jittering madly as the game struggles to decide between whether it should accept Y inputs from the pedal or from the stick.
Is there any way to force DCS to read the pedals as an entirely separate controller, controlling separate inputs? i.e., the JOY_Y should not be reported by both the joystick and the pedals, but rather there should be a sort of "JOY1_Y" for the pedals and "JOY2_Y" for the flight stick?