One thing to remember is that a setting of 0 is not the same for all players.
If someone has 0 PE and 90 LP .. with a setting of 0, the vast majority of his shots will be 2 point shots. If he has 100 PE and 0 LP, a setting at a setting of 0 he will take many more 3 point shots.
A setting of 0 means, shoot 3 point shots based on your ability (ie, how well you shot 3's compared to how well you shoot 2's).
If you want to shoot more 3's than normal, that is +1 .. less 3's than normal is -1 .
If you want to shoot a 3 whenever possible, +2 ... if you want to never shoot 3's, -2.
Never shoot does not count half court shots at the end of a game, etc.