All God Mode would do in Campaign Mode is sequence break and screw up the scripting, which I can assure you would not be any kind of fun. The scripting system falls over enough on it's own without help from God Mode. That being said, i'm sorry you're bored of the game and can't appreciate the appeal of god mode in sandbox/skirmish modes.
That is the whole point though. I want to break the game. I have always found it fun to break games/software in ways not intended. The Sandbox/Skirmish modes are already so open and nonrestrictive and designed to let people do whatever they want. Using God Mode in a skirmish game is like making a map while playing it instead of having to make it then play it but. It's nice feature that I appreciative but it's like "big deal , whatever".
Besides, maybe I don't want to make drastic changes to a campaign map that would break it, maybe I just want to remove a single rock tile that was bothering me and was preventing me from making a 5x5 room.