I actually used to use the single 's' keypress a lot. But at the same time I wasn't happy about that habit, it was often lazy-thinking, instead of using things like cf{char} or even cw, ce. So I committed to use '1s' when I really needed the single substitution, and it worked really well, so I felt I had gained on both sides. Just try and see what you think, you can always remove. And yes I will make it customizable, but I especially wanted to release this first opinionated version exactly to get feedback like this. Thanks.