Should a church have an operating manual outside of the bible to help explain duties?

I am a member of a small congregation. I am also the Janitor...and I have clearly spelled out duties... I am also head usher and have clearly defined responsibilities... most "churches" are incorporated entities... with legal liabilities... there are things that need to be "in writing" in the legal worldly way... that is the way any organized group needs to keep things in proper order... in BIG "churches" it is most important... in our small congregation every one dose what they can...but I co-ordinate any thing to do with building maintenance...and scheduling of the facilities... that way someone can't just start painting the walls because they do not like the color or throw a party when there is a funeral scheduled...