I havn't tried or downloaded it because I can't until Wednesday. But I would like to know the point of this. Couldn't you just use On>PlayerTouch> on the brick you want?
I'm not trying to criticize just would like to know before I download.
The Rocket Launcher, Sniper Rifle and several other weapons are much larger than some smaller bricks. If you walk beside the brick it's spawned on or use jets, you can avoid the brick entirely while collecting the item. onItemPickup is triggered when anyone picks up the item, not when they touch the brick it's spawned on.
It also works for items spawned by
spawnItem, which have a velocity component, which means they could be a distance from the actual brick.