Both my cars have cruise - the 'Bird is a 6-speed, and the 65 Mustang is a 5-speed. Cruise is and always has been available on both manual and automatic.
I just wish more people would use their cruise. Most of the time you get behind a car on a 2-lane road, their speed is constantly going up and down. That wstes gas, too. Economy is probably one reason cruise is standard on the new Mustang. Good for them.