It seems that if I move back first, then move forward, Wheels can move back normally

Hi. There is a conflict between input direction as FPIO and as detected by game itself. Mod dynamically sets speed slider value to interpolated in [0..(forward-backward)]. So if backward key has bigger simulated value, then it ends up in negative speed naturally.
At the same time game checks if backward key is pressed and forward is not, it inverts value. So pressing backwards gets minus from FPIO and another minus from game, ending up with plus (forward).
Right now I can't figure out how to fix this. Changing FPIO logic to not get negatives breaks LERP mode since all LERPed keys are treated as (almost) always pressed by game and it applies "plus" since forward is also held. I guess for now we have to use FPIO mode only for LERP-controlled gears, not manual-controlled ones.

Oh nvm, I've just applied in-game negative detection logic once more to level it out lol.