Both things are built-in about as good as they could be. You can't have a simple walkthrough on a game that has almost infinite path options. There are many characters you can have scenes with and might not want to, and those can vary by stats, what other paths you've taken, and more. A Walkthrough has to know exactly where you are, and where you want to go, to tell you a clear path from A to B. This game has scores of locations, varying by time of day and day of week, relationship stats, corruption stats, progress flags, and tons and tons and tons of choices. Hundreds of possible alternate paths already when you work out all the possible permutations.
The Cheat menus that are built in lets you adjust stats, paths, etc. Even to the extent of breaking the game if you mess with them without knowing exactly what they do.