One example would be more information on how "open" a shot is when a player attempts it. That would be information a clever manager could use to assess a player's shooting skill, the passer's ability to deliver the ball for an open shot, or the defender's skill at preventing good "looks."
Yes, this is something absolutely missing.
I think we should get the info about how contested (and by whom) was every shot.
Something like 5 levels of contested:
1- Completely open - "John Smith tries a completely open 3pt shot while Mark Jordan just observed from distance"
2- Uncontested - "John Smith tries a mid-range 2pt shot uncontested by Mark Jordan"
3- Contested - "John Smith tries to dunk contested by Mark Jordan"
4- Hardly contested - "John Smith tries a floater hardly contested by Mark Jordan"
5- Extremely contested - "John Smith is forced to shoot from distance extremely contested by Mark Jordan"
This would give many relevant insights about both the offensive and defensive abilities of the players, it would allow advanced stats and so on. It's just hard to say if it's feasible since no one really knows how the engine works. But it would be great if it was.