Once you decide to buy a Mustang and you own it, you do have a choice. You can change the rims, get stickier tires, make the exhaust note different,,,,,,a myriad of things. Same with the auto start stop. For less than switching air boxes you could have an A.S.S. eliminator installed.
I have a ‘24 GT manual that has auto start stop. What I’ve been doing is just pressing the red start button and at the same time press the A.S.S. switch when you start the car. The light comes on turning off the switch….check it out. Ends up being one press, two fingers each time I start the car.