A toggle would be better than what we have right now, but I'd much prefer if the game just checks on every atteack if sneak attack applies, and if it does, then you deal sneak attack. No extra button needed.
The benefit of the toggle is in the ability to not use your sneak attack on the first hit (which you should be able to do). You will have the toggle on most of the time. But if you want to finish a 1hp enemie, befor moving and attacking again, you'll be able to not waste your sneak attack.
