I've thought about introducing a similar feat IMC, called Natural Talent (class). Hence, core rule elves would start with the feat Natural Talent (Wizard).
Such an approach has the advantage of making races slightly more customizable. A nation of elves with a more martial culture could choose between Natural Talent (Wizard) and Natural Talent (Ranger), for example.
The equivalent feat for core rule humans and half-elves was something I planned to call Dilettante - the ability to pick up a superficial knowledge on a variety of subjects.
No, I don't think it's unbalanced.