The cheat "LOCK" that you're talking about is also in the Xbox and PS3 versions of the game as well.
FYI, costume cheats don't disable the auto-save.
However, if it is the same as the console versions, you will have to memorize where the save points are and if you have used the cheats, just quit your game when you get to the save point and then hit the "continue game" option and the game will be where the last save point was and you can save again.
Now if you're using an instant kill lightsaber, it will be deactivated, but codes to up your attributes will still be active.
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