Position of the shooting hand before releasing: Is the middle and/or index finger in the middle of the basketball?
To be honest with you, I don’t know where those fingers are. All I want is for your hand to be behind the ball (as opposed to on the side) and in the same place every time. Again, it is a feel thing.
I do not get into the really picky little things, such as what direction your fingers face or making everyone put there hand in the same place. It will be different for different people. I think that the most damaging aspect of any skill, which coaches seem to add to, is “analysis paralysis.” That is a saying where you worry so much about the little things, you examine what you are doing so much that you paralyze yourself and can’t perform the skill at all. I prefer to remain focused on the big picture.
If adjustments need to be made, make them generally. For example, I will say, “put your hand under the ball,” instead of “put your hand here.” I want players to shoot the basketball without thinking of anything. The more minute you get with technique, the more they think about and the less effective they become.