Add sliders to control parameters of the simulation such as:

1. Cohesion, alignment and separation coefficients
2. Number of boids in the simulation
3. Field of view of the boids (both angel and radius)

For example:

1. Add the ability to show a given boid's field of view
2. Add the ability to show cells of the quadtree or the spacial hashing table.
3. Add the ability to show for each boid its neighbors
4. Add the ability to display the vectors for each steering force, color coded
5. Add the ability the pause the simulation and then resume

Add a type of boid that is a predator, which would try to steer toward boids from other flocks, while all other boids will steer to avoid it.