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Player's skill/Player's mastery

As an option - offer to introduce the system of improvement of skills on specific role, instead of a new scout, you must agree, is better when the native players on your team, not someone else's, even if it is possible to change the name (:D)
And if there is no maximum number of level-uping skills, make them 10
I don't know if anyone talked about this idea before, but this idea is pretty good
I do not know much English, so forgive me for this :D
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You can improve your own players skills with coaches.