Did you ever find a fix for this?

NO, not at all.

Damn. I've been trying a bunch of things to get this to work, but I've hit a dead end. 😞

Yeah, it's odd that it's blacked out. Wonder if it was removed at some point and no one bothered to update that part of the menu, you know.

Ask Randy

have tried everything obvious. found the cfg, changed 1 to zero, no change. tried 2, nothing. disable steam input entirely.. nada. directinput? nope. xinput device isn't ungraying vibration for me either. would like to know what the reason is. have plenty of different gamepads. want to use this one.