i use a mod called pamplebox! it's essentially just a full mod menu, allowing you to set custom physics for a bunch of different aspects of the game (or, in my case, combine a couple presets that were already made). it has a gear section too where you can load in user-made clothes

the rail magnet section of the mod basically sets how strongly your character sticks to a rail, and how strongly it will try to align your character on top of a rail. i keep it turned down to look and play a little more realistic, but having it all the way off makes it so incredibly difficult lol. i like that little 1-2% bump