Nice, I wouldn't want it to be automatic after pinch but that looks promising and I'm sure could be modded, maybe pinch zoom and then if you keep holding the two fingers without moving much for X amount of time it reflows

Yeah, it is sometime annoying when text reflows if you only want to look closer at an image. But most of the time it's not really an issue, you just need to reposition. Maybe give it a try anyway :)