Sorry if the question has been raised before.
I've just begun a campaign for players new to roleplaying that, of course, are having a blast with Gumshoe. One of them, being a huge fan of Hellblazer, would love to have her character turned into a sort of Constantine. We know that it goes against The Esoterrorists cosmogony having player character sabbling with magic since it's "evil" and more apprpiate for esoterrorists, but, shouldn't every GM always provide to the desires of her players to ensure maximum fun? So I'd like to know if someone has ever developed and posted house rules with an optional magic systemfor heroic Ordo Veritatis agents, even if it takes their souls.
Thanks in advance!