I do apologize in advance for the massive bump, but I've been struggling with the same issue using my xbox one controller and I found a solution. with xinput plus you're able to rebind both triggers to two separate axes (and the right analog stick as well, to maintain the complete analog functionality of the xbox controller), just select the LFS executable, then go to the directinput tab, enable directinput output, apply and voila. rebind throttle/brake (as separate) and whatever you wish on the new axes and you're good to go - vibration works too, now.