I have an idea about how to implement this training camp thing.
Basically, that would be an extra training week for players. At the beginning of every season you send all your players to the training camp and set their trainings individually.
Player 1: Pressure
Player 2: Inside scoring
etc.
It would have the effect of one week of training, at 48+ minutes. So basically 15 trainings per season, instead of current 14.
-It would help a bit, if you have 2-3 trainees, and you need to train different things.
-Non trainees would also get that minor training.
-Would be fun, and add a bit of realism.
It could be charged for some cash, or not.
It could be implemented on friday night/saturday morning. You get normal training friday morning, and then another training from the training camp, morning before the first league game.