I think it would be a great idea to have visual diagrams for each feature so new users of the product could see all the components that need to be reviewed for a function to work. This would include what is field data (They usually just fill in once), configuration (What they fill in to setup the service) etc.
I started by creating one myself in the early days of use, It's likely wrong but feel this would be a great help for relationships of each function. My plan is to develop one matrix for ourselves in the future so when you change something you know what else may need to be changed or fixed.