i think it might be a two button hold, somthing like assassins creed. hold a button for sprit and hold another button(mabey the jump button) with the sprint button to use smart, then let go of the jump button to stop using smart and stop pressing everything all together to stop moving/let go
No, the smart button is the sprint button. If you just want to sprint without SMART activating, you can tap the button and it will toggle sprint. I imagine when you stop moving, sprint turns back off, like in Borderlands if you have played that.
But anyway, the smart button will be the same button as sprint is in other games, on all 3 consoles.