Sounds like a great idea. I would be a little worried about how often I actually am not looking at the window I am typing in. Though, I suspect there are obvious patterns.
I think that is what worries me. For most purposes, this is fine. I do, however, sometimes have a transcription use case. This is fairly uncommon, but I worry that I would get bitten by it being taken away.
That make sense? I still think this is worth trying.