I noticed the projectile class and fields are identified correctly so I just wrote a small API myself using reflection for private use, but it would be nice to have an official API (or just a projectile interface) for this.

For scripters
- A fight cave script becomes possible;
- Could be useful for anti-pk methods;
- Perhaps more useful with future updates of the RS client.

I can imagine there's no API for it atm because only a few scripters will actually use it, if that's the case I'd be happy to create/maintain an unofficial one if a projectile interface and projectiles getter is injected 

See 2.3.124. We actually did have them injected in a private beta test with another scripter. Funny that you posted today because we agreed yesterday to release it in a Dev build today.

It's still very much a WIP.