This is more of an educational question, than a problem.
On most cars I have seen, the cruise control activation is in two steps, you usually have a separate switch to turn it on, and then you have the "Set" button to activate it.
Why is this that way? What is the purpose of being able to deactivate it in 2 ways as well - using the master switch/button, and a separate "cancel" one next to the set/restore buttons?
Also, on most vehicles if you power down the car, on next start the cruise control is deactivated, and you need to activate it again using 2 controls.
Is it bad for the engine/transmission if the cruise control is always on? I ask this, because thats how it is on most cars, but on my Honda Odyssey it does not turn of on engine restart. Its on when I start it again, if I left it on when I stopped the car.