Support for some kind of force feedback or rumble value.

[ghorricks]

Hey,
Couldn't add a pull request, so dumping this here.
Logitech G29 wheel working great except the force of the wheel is so strong that I ache after a Grand Prix. Is there any chance to have a setting available to state the percent of feedback used as it defaults to maximum at the moment.

Config file I use is here:
https://mega.nz/#!opEETIrD!HcjUSglfc7LBoZ_toPx3zrbB685pyqk5h76v-OzCUrg

Thanks for the excellent work from all in the community.

[ghorricks]

Link to a video here : https://youtu.be/N79Rz9mpcsQ