Dyn085: ah... inertia, a wonderful thing.
FFhb13: Blading the crank is not just for racing. It makes it much easier to mover through the oil, plus less weight. Good for acceleration... bad for highway driving due to less inertia. Same with a lightened flywheel... good for acceleration, bad for inertia (i.e. it will affect economy where speed stays constant). A bladed crank is a very nice mod to have, but it is a big cost with all the work involved (engine removal, strip down, removal, the actual work, possible hardening of crank, balancing of assembly, refitting etc.... and would mean that you likely be adding other uprated parts in there as well lol).