If I accidentally *mistype* one character followed by five correct characters (before noticing the typo), this counts as one single typo on my accuracy score. 
If I accidentally *omit* one character followed by five correct characters, this counts as six typos on my accuracy score.

As a result, omitting a character (and noticing it late) results in a large drop in accuracy. This is not very intuitive.


STEPS TO REPRODUCE
1. Start any ktouch lesson.
2. omit one character, type a few more.
3. observe how your accuracy score plummets.

OBSERVED RESULT
The accuracy score penalizes omitted characters much harsher than misspellings, in case one doesn't notice immediately.

EXPECTED RESULT
Omitting a character and typing a wrong character should result in a similar penalty. 
A natural behavior would be: If a character is omitted, the following characters should be highlighted as errors (underlined in red), but only the first incorrect character should count against the accuracy score.