I totaly agree with Siddharth!! The SA can make a good player better in a certain skill but if the player is a poor corner/freekick/whatever taker the special ability will be wasted on him. And the essential Qualities are programmed and don`t change. My best Corner and Freekick taker is my GK. He scores almost every match or at least got a assist. He actually got more goals then my best striker (maybe I should get new strikers).