Q: what is the use of switch control ?

when i go to switch control and add a new switch as screen tap. then i enable the switch control. what is the use of that? every time i tap i get the app switcher(multi task) which is good but to go to a certain app i have to tap home button 3 times. i dont know if im wrong. but in switch control i can add gestures but cannot find a way to use it. (simply if i can add special gesture like a swipe with 3 fingures and if  i can get multitasker or siri or any other program it will be very use ful isn't it?)