When at idle on the runway, the plane will actually creep forward until the brakes are applied. Most other FSX aircraft will not do this. When I release the brakes and still at idle the speed will
actually get up to 35 MPH without adding any throttle. I know with the Capt Sim C-130 I don't have that issue. In a real P3 this may be normal, I don't know for sure.
I did manage to tweak another issue with the Props spinning IMHO a little too long after the engines have completely shut down (No engine noise).
in the Aircraft.cfg file I change it a tad:
propeller_moi=07.000 ///24.00 << I put the // marks to save the original setting.
I have experimented with the values and it looks like the larger the number the longer the prop will spin.
I set it to 07.000 to suit me as it seemed like the propellers were spinning a little bit longer then necessary after shutdown.