I guess he needs a boolean for player to toggle it.
The most efficient would may be to use a multiplier that is set when the boolean value changes so it is not set on tick :
I’d be glad to learn what is the best place to save this kind of player preference. I personnaly save it in the save game object and load in the game instance because that’s the only way I know, but I would have prefered an ini file for exemple or something else.