Thinking in this again I will add that tlking about a "extra SA"... this can be added too to have a little bit of control under the player, so for example, I would add a SA called Fast training, which could ive a x2 XP gaining when the player is in a rank between 1 and the 7* or years ago I was talking about something called "Loyalty" which means that a player will stay in the club till he passes the 34 age.

I think that can be good add some Special Abilities, despite that maybe can be limited to a few players in every club, to control de players careers a little bit more-