I am using a gamepad to play PoP: TSoT. Everything is set up okay already except for the walk toggle (aka shift on the keyboard). When I try to set it to any button on my gamepad, it will revert back to being blank. Other key mappings don't have this problem.

I was thinking that this is a bug and so I tried to set it manually by locating the settings file and adding the button number there. However, when I saw my profile file contains binary data so it's all gibberish when viewed on notepad or notepad++. I want to know if there's any other way to make this work?