What I mean is this: How about adding a function where skritter would list the words that you often fail at.
For example, when you have failed to write or translate a word 5 times, skritter would automatically add this word to a "words you need to practice list".
This way it would be a lot easier to keep track of those words you may need to practice more, add memnonics (spelling?) to, change the definition of, change the example sentece of etc.
It would be kind of an "automatic" star function.
I'm sure skritter keeps track of this information anyway, so why not use it!
Also, this would be great for people like me who mainly use our phones to skritter (where there is no star).