You can turn off zombies by setting the moon to a constant phase other than full - but really, if you put a fence around your garden, they're not much more than a nuisance - you'll occasionally get a groaning sound effect, or possibly a floor show if you accumulate a bunch of zombies and put a stereo outside. Alchemy is almost abusive for Dynasty requirements - Potent Cures in case the otherwise-ideal spouse is an unavailable life state, Potent Friendship will let you make those best friends in an instant, Wish Enhancement to get double points for your LTW... even the basic Invigorating Elixir is better for staying awake than coffee.