Adding an error type to help analysis

[MostafaEwis]

I think it would be really helpful if a type of the error was added to help analyze the weak points of a person's typing.

Some ideas that came into my mind are like:

• misplacing two characters like "can" and "cna", this would be very beneficial for people who don't have their hands in sync and need to work on that more.
• writing a wrong character: like "can" and "cqn".
• specifying what hand produces more errors based on the keyboard layout, for example writing "ckn" instead of "can" was produced by the right hand on a QWERTY layout.

I think there are more helpful error types that can be added, but those are which came to my mind.