Earlier quoted context omitted.
Doesn’t most automatic transmissions have that? My old VW Touran have paddles on the wheel for changing gears. I only use it when driving down steep hills though.
Older automatics (my previous Opel/Vauxhall Astra G) had 3 modes, two being for slopes. But not always manually choosing the gear you like, which modern automatic transmissions do appear to have.
After 1980, an 'overdrive' gear was added to most transmissions. "Overdrive" in this sense means that for one turn of the input shaft, the output shaft would turn slightly more than one.
After the early 2000's, we started to see the introduction of 3 and 4 planetary gear sets bringing the total gears anywhere from 6 to 9.