the .990 pin will decrease the weight of the rotating assembly and will therefore be beneficial in the long run. getting the bushing put in isn't that costly and really should be done when you resize the rods anyway. at that time i would go ahead and polish the beams of the rods since your not replacing them to eliminate any stress risers then have the whole assembly dynamically balanced.

sometime with the use of lighter components you can eliminate the need for adding mallory metal to a cast crank or at least minimizing its use so ultimately it does save you some money