Yeah, older games that dont support xinput wont let you use the triggers as they are recognised as Z axes by the OS and the games need digital buttons. Xpadder used to be a free tool with excellent features to change the trigger behavior. I used it very much during the late 2000s when the controller support was not great in games. Keyboard emulation doesn't feel "right" like the above poster said, but your mileage may vary. Give it a try.