I wouldn't tack this on to another mode... I'd propose this to be a standalone mode for people who wanted to prefect the techniques they need in a game as an alternative to the current practice mode that assumes players already have the skills to execute the play.
If a player doesn't pass the first stage of training camp, the coach doesn't install another play and they get to keep working to perform the play according to a standard NOT SET by the user. If a user passes, he gets to decide what play the coach installs next.
In essence, the coach says: "Run it til you run it right!"
Later

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