I literally just played a mission where nearly every unit in my squad kept auto switching and annoying the hell out of me. If you look at the feature request here you’ll see others have brought up even more points (other than what I’ve mentioned) that annoy them, too.
You can press TAB to move on to the next soldier. But there is not key to press to go back to the previous soldier quickly, unfortunately. Personally, I use WASD heavily when playing so TAB is always in reach of a finger that is otherwise doing nothing. No clicks there.
All we want is an option in the settings (probably under gameplay?) to turn it off for those of us who find it annoying.
It is not just for Quick Aim, though. Inventory access at the end of a move, switching weapons after an attack for return fire optimization, reloading, evac, etc.
I do! Lets just have a setting so those of us who are annoyed by it can turn it off!
That is pretty straightforward, does not affect gameplay or the experience for anyone else!