What do you mean by "smoothing the caret"? I just tried the app to see if I can make sense of it; do you mean that the caret does not blink if you continuosly insert characters?
That looks incredibly unpleasant (to me), makes positioning the cursor like slipping over oil. I prefer the discrete jumps that the cursor makes :)
When you type a character, the cursor smoothly animates from its previous position to the new one. As opposed to most apps where the cursor instantly jumps one character width to the right.