Ok, added more natives, look at the include file for complete list.
In this video i'm using last bullet hit for traceline end point because i'm too lazy to get it from player angles. I set gravity (or apply force at hit point) of traced object by console bind.
http://www.youtube.com/watch?v=fAJlHJehlI8
So if you want objects reacting to bullets or explosions, use bmod_traceline and bmod_object_apply_force_at (this takes relative position, so substract it from entity origin).