use notepad to open core.ini and look for this line
[ Joy ]
allow_force_feedback = 0 ; Use FF if device has it
change that to:
[ Joy ]
allow_force_feedback = 1 ; Use FF if device has it
save and reboot gpl.
make sure you are editing core.ini not core.ini.sample
http://theuspits.com/owheel/gpl/index.html
Mike
Andrew