It is good to hear about your practices, Planto. I always find with patience, many insects will be regulated by other insects in my garden. It's difficult to watch aphids suck on tender plants, but with patience, you get to see the ladybugs come and devour them. Then you get to see the ladybug larva crawling around everywhere. Then you see MORE ladybugs.
No one should EVER kill a snake. They are vital to environmental balance. It is not the snake's fault that someone fears it, and it shouldn't have to die because of someone's irrational fear.