The supply points are directly combined with the time u played in the game. Just changing the value would not work but if u can find a pointer for the time u spent in game (Not the time it's showing at the bottom) it would be possible to hack supply points by increasing the time value. Im not sure if there is any limit for that but u just gave me the idea if it's possible to just set the time to sth extremely high and get tons of 5k supply rewards. I will try this