Sheldon Brown claimed that left foot forward when putting pressure on both pedals was better on the bottom bracket, splined ones or square taper. because right forward produces more reverse torque. It may loosen the cranks if coasting "goofy-footed" instead.

Left foot forward stresses the crank in the usual pedaling direction, right foot stresses backwards from the usual direction.

He's right as far as that goes but I'm not sure that I buy it that it really makes much of a difference.