Well, digging around the fightingart folder of the startup file I found the FightEngineScript
After unpacking it, I found this file in it's data2 folder called plyr_back_to_normal_from_button_press
Inside it, there's a 4 byte float near the end, seemingly, a variable. By default, this is set to 0.20x
Currently, it's set to 0.05x
From the testing data I've received, setting it higher (say, 1.00x) makes inputs register less (in fact, setting it to max, aka FF FF FF FF causes a game crash after letting go of an input) while the opposite happens if you set it lower.
The issue obviously is that one would normally think of setting it to 0. But if you do that, the inputs get way too floaty, and a different type of input bug takes place: you could have pressed forward like a second ago, and it still acts like you are pressing IIRC.
Floaty and laggy is what happens if you set it absolute zero.
From the testing, 0.05x seemed to give off the best results (0.01x starts to get a little too floaty)
It doesn't affect negative edge apparently.