Hello, I have this single engine plane,When i'm on the tarmat with parking brakes "on" and i give just a little bit of throttle,the left wheel digs halfway into the tarmat? (by the way,it's a taildigger,with piston engine).When on idle everything is fine,if i take parking break "off" and apply again just a little throttle the plane moves quickly (turns) to the left? I downloaded some tutorials about .air and .cfg files,and stuff about MOI etc..but don't fully understand or know the proper setting to input to correct this problem. Please help.

It only appears to be a "problem." You are simply observing the effect of the engine's torque...

Could it be the engine torque is set to high? also do you know how or if there is a way i can make the propeller turn more slowly on start-up,it turns about 1 turns then goes to full idle spin,i would like to make it turn about 3 turns before going full idle. thank you.