Just installed a preliminary version of what will be the next MooTyper release as version 3.8.3. The most notable item it has is a, Mistake details, listing right under the status bar, and just above the text-to-type. It gives a detailed listing of each mistyped a character with a count of how many times you mistyped it.
When a user goes to View my grades, they will see their mistake count and mistake details, listed in the Mistakes column, for each completed exercise.
When a teacher, admin, or manager, goes to View all grades, they will see student mistake counts and mistake details, listed in the Mistakes, column for each completed exercise, for each student with any completed exercise.