Well you already had a post similar to this, but oh well.
I'm afraid that something like this most likely isn't but may be possible, but it's not going to pop out of nowhere. It takes a lot of coding, etc.. to make things like this. I recommend reading things about computer games, 3D Engines, and how they are used, because right now this doesn't exist. Tremulous doesn't have Rag-Doll effects or AI NPC's. You may very well be able to add in the models, but they will do nothing.