Changing the score can lead you to missing events you need to complete to get other scenes.i only changed the score with the cheat. didn't touch anything else.
The Relation Scores should only be manipulated up after you have lost points during a scene or at the end of a completion of all events available for that version (and all previous versions) based on the point system showed at the top of the walkthrough for that version.
The only other points you can manipulate at any time are the Gentle and Rough settings which don't affect events from happening just the scenes you get when you repeat them.
You can use the Money cheat all you want!
And I suggest people who want to see EVERYTHING the game has to offer should keep two save files to play through...
One with the Billy Path and another without after having given Billy the Coupon so he never bothers you or has sex with your family.