[tril]

The only way a coach feature will truely work is if you take the game calling ability out of the players hands. Other than that the player playing the game is already coaching, by calling/running certain plays, subbing certain players in and out.
the only possible way coaching could work is if they implement this during practice sessions. not practicing certain plays for games can have an affect on whether a play works during a game or not. thats how I see coaching implemented.