Is it possible to make these kind of changes to the Feral Ghouls and Coursers at the moment with the creation kit?

Increase the HP of all types of Feral Ghouls.

Every Feral Ghoul have a 25% chance to reanimate themselves everytime they get killed, unless they are dismembered completely or blown up.

Double the movement speed of all Courser.

Make every Courser in the game wear patrolman sunglasses.