I've never had need of a cheat in Thief. (Assuming the level is well-made enough.) But I don't get what all the brouhaha is against using cheats in games. I guess it's one of those e-penis size issues and I've never cared much for the bravado.

Let people play their games anyway they can. It's for fun after all. Fun that most people paid money for. Not some entrance exam into the Society of Thieving Guilds.