What I think I'd like is to type a whole input and then go back and select corrections all in a batch. The correction mode could use more of the screen to help

What I think I'd like is to type a whole input and then go back and select corrections all in a batch. The correction mode could use more of the screen to help you go faster, plus take advantage of rightward context as well as leftward. Very probable corrections could take advantage of Fitts' law or maybe grouping of multiple corrections into one. The goal is to never get 'corrected' without my assent, while still going fast. This might be underexplored, because designers aim to keep it easy for everyone without training. (But this is also likely just a bad idea. I mostly just don't type on phones and curse them when I do.)