For Cheese Cube the mp40 can shoot the colorful circles with cheese in the middle on the walls which give you points, PhD can also stop your fall and the points perk double dew acts like a double points, and I'm pretty sure it stacks with double points itself and yes the boomhilda in cheese cube is good.
Fyi.... Every time you interact with the zombie if it gets close enough to make a noise and grab at you it will change speeds every time it interacts with you so if you have a fast one go over and let it try to hit you.