I tried them in the quick questions thread, and I think they're too difficult to answer for there.

1. Is it possible to prevent an npc from ever mounting horses?

2. Particle effect shaders appear to behave in two distinct ways: sometimes they conform to the shape of the models they are visible through, and sometimes they completely ignore them and behave like a cloud. The only way I've been able to consistently trigger the former (and desired) version is to load them, then reload them, then recycle them. What is happening in the engine and how can I control it?

You're kiddind!? You'll never find better place to get an answer than the Quick question, quick answer threads. That's where people are.