Is there a justification for edits having to be 6 characters long? I tried to correct someone's arithmetic. They wrote $4 \cdot 8 = 48$. It's a one character change! (Or 2 if you count insertions and deletions.) To make a six character change doesn't make sense. I'd have to find some completely gratutitous change to make up the other five (or four) characters.
The question in question is Tricks for computing things in your head . The error is in the answer that discusses the "vedic" multiplication algorithm.
I can imagine other small edits that would be be useful. E.g., to add a forgotten apostrophe or coma. (I mean "comma". Woo, good thing I caught that before posting!)
So this is a feature request to reduce the minimum number of changed characters in an edit from 6 to 1.