Add an EntityLivingThrowItemEvent.

This event would be triggered if you throw a snowball, an egg or Biomes o' Plenty mud, etc.
This would be usefull because it would be easier to access the entity being created after the throw.

There isn't an event in forge for when an entity throws something like that, there is an event for when a thrown entity impacts something, not sure if this is what you want though, if it is, make another issue..

Is there an event for entity creation in general? If so, you could maybe get at the snowball there.