I either cannot cannot find such a setting or simply does not exist ?

Most messengers have the option of the auto scrolling down to the last message rather than having to manually scroll down each time. Normal behaviour is if you scroll up, the auto scrolling simply turns off. And if you scroll down to the bottom manually, it then automatically turns the scrolling back on. So if you want to go back and read messages then you are not fighting against the auto scroll.

I may be the only one who thinks its annoying, but if someone is talking faster than I am reading stuff then they deserve not to have their messages read IMHO :) At the very least it should be allowed to the user to enable or disable that option.