I'm just curious as to whether or not a lightened flywheel would significantly reduce wear and tear on my stock RS gearbox provided I didn't start driving it like it was someone else's S2000. I am inclined to reason that the reduced rotational inertia= reduced driveline shock and smaller forces working against the synchros. Would having one extend the life of my tranny, and/or enable me to be a little rougher with it and have less chance of a failure?

man... bumping without a single reply.... I suck.

Well I don't think that the weight of the flywheel makes much of a difference as far as the syncros go being that the clucth is pressed in while shifting.
But I want one for a little better throttle response. I would expect that launching will be more difficult but that's what practice is for.

The weight carries a lot of inertia which translates into resisting force against the input shaft when the clutch closes and revs aren't matched. May be wishful thinking, but it makes sense to me that the flywheel could actually be a good investment.