Clutch start cancel

I have been looking at manual tacomas lately and noticed a clutch start cancel button
Did a little research, hear different things, that it makes sure u don't roll down when on a slope when you start the car or to start it wt out getting inside.
So how does that work, does it help prevent the car from stalling or rolling back when stopped at a hill?
I heard that you place it into first gear and start the car and it moves it forward? And starting it in neutral basically just means u don't press the clutch if I'm not wrong?

 

Clutch start cancel allows you to use the starter motor to rock the truck if stuck. So you hit the button put in gear and turn the key. Yes you can also put it in neutral hit the button and start it without getting in the truck or pushing the clutch.

 

Also curious, what happens if I leave it on while driving?
Does it prevent the car from stalling when u let go of the clutch in 1st gear while stopped?

 

Nope. Doesn’t do anything other than make it so you don’t have to push the clutch to turn the motor.

 

Cuz ik when it's in gear and u start it, it moves the car forward so I was assuming it'd be similar when stationary
What else could it be used for, or is it useful only for those 2 things?

 

That’s pretty much it.

 

This ^^
All it does is allow the truck to be started without depressing the clutch, up to you how you use it. It stays active until the key is turned off, I use mine so I can start the truck without getting in just make dang sure it's in neutral before you do so.