Valve's "Left 4 Dead" had a system like this called the "AI director" that was pretty well-received. See the part about "Generate Dramatic Game Pacing" http://

Valve's "Left 4 Dead" had a system like this called the "AI director" that was pretty well-received. See the part about "Generate Dramatic Game Pacing" http://www.valvesoftware.com/publications/2009/ai_systems_of_l4d_mike_booth.pdf http://www.valvesoftware.com/publications/2009/ai_systems_of...