I'll admit I dont know how it works in game but IMO even putting left or right fielders in centerfield, there should be ZERO penalties. whatever reaction(range?) and speed attribute ratings they have should be the penalty that matters. If they possess good enough speed and range to play center, that should be all that matters, again IMO. same for putting a left or center fielder in rightfield, if they dont have the arm strength and accuracy to man rightfield, well, user beware. dont need any extra penalties in outfield, ZERO. unless you put a catcher or second/third/first baseman in the outfield