How do we feel about where the period goes at the end of a quote? Students, when consistent, tend to use logical punctuation (see Slate article for argument). If they (students) choose “logical” punctuation, they have to state that in reflections before papers are turned in, and are advised to discuss grammar conventions with future teachers beforehand.
And on the Oxford comma: see comic – nuff said.
http://aeferg.tumblr.com/post/10290286196/grammar-is-important-kids-credit-for-original
