1. Npcs actually talk to each other instead of a scientist saying "how is your novel coming along" and nobody responding

2. More voice lines

3. Updated Xen gibs

4. Add gestures, such as asking a scientist or security guard to follow.

5. Update animations, or make security guards use less metrocop anims and a little bit more male citizen animations

6. Episodic zombie flinching, is a feature in black mesa