Repeated Firing/Multiple Projectiles!

Does anyone know how to add multiple ranged attacks to a boss and make different firing speeds.

I'm trying to add a boss to my mod space and beyond who has 3 attacks.

1: Shoots 20 bullets (One Bullet every 5 ticks)

2: Fires a Missile at the player

3: Shoots a constant barrage of lasers for 5 seconds. Kinda like a laser beam.

Do you know how to do these attacks and make them occur randomly?

Also, is there a way to make it fire on different parts of the model. For example, the bullets come out of a minigun, the missiles come from a bazooka and the death ray fires from a cannon.

Is there any way to any of these? If not, would you consider adding this in the near-future. Thanks.