Maybe I’m using this site differently to other people, but for me not everything is about the cloze word; in fact often very little is. The cloze word is just a means to an end. The word itself may be a pronoun, or a possessive, or a basic adjective of size or colour. Sure, I could knock over such basic cloze words in no time flat but the CONTEXT in which it appears may be very different in each sentence. There may be idioms, or colloquialisms, or other expressions that I just haven’t come across before (or don’t remember having come across before because my memory is rubbish, which is why I’m on fairly short review cycles) that I want to research before I move on. After all, the site motto itself is “Learn language in context”.
The flip side of that is that there are some words that I always seem to spell incorrectly if I speed through the input, which means that it takes me longer to answer them even if I know the word and its meaning off by heart. (It’s less of a problem in Italian which is delightfully phonetic, but it still exists.)
In short, my concern with this suggestion is that I don’t want the system deciding when I’ve mastered a complete question by what is often (for me at least) an unconnected metric; that is, the time that I take to type the cloze.
My standard position is not to try to knock any idea on the head if it will work for some other people… as long as it remains optional. I still don’t want the system deciding when my reviews come; imperfect as the system may be (though it’s not currently THAT imperfect IMHO), I want to keep control of that completely in my own hot little hands.