I am the DM/GM for my group. All of my players understand that I apply rule 0 behind the scene and generally do it secretly enough that I do not get called on it.
Temporary HP, Extra Spells, additional HD of controlled undead. Modified templates, etc. I have cheated in all these ways.
My...
I am brand new here, but I have been DMing for almost 10 years. Early on in my experiences as a player I found that the off the shelf module was too rigid to suit most players. If someone wants the "go here and do this and ONLY this" type game they should buy a computer game.
That said...