[Gollum]

I do agree too. Self control means awareness of the disadvantage ... To resist to something, you have to know it exists.

And for the pyromaniac wizard example, I would say that the player can come into play with such a character who don't know any fire spells ... But if there is an occasion to learn one, he will have to make a self control roll to resist. Pyromaniacs love flames ... Learning how to ignite fire magically would surely be terribly tempting for them!