I tend to imagine you're talking about "small lie" a lie that's not too serious. I don't think there's something like that. Even in the bible there's a mention of sins. A big lie and a small lie, but God says, a lie is a lie no matter how big or small it is. By big or small Iie I mean, there's no difference between someone who has cheated on his wife and someone who lied to her parents. The thing is they've both lied.
I hence think, if you should cheat, don't think that your lie is mere because punishments will still be the same provided that you cheated. If its living a righteous life, then do so to avoid the penalty.
That's according to my understanding, I don't think there's any other meaning of "micro" cheating but then am yet to know.