Racial powers are too potent to be granted by one feat. Just don't do that, is what I say.
What you could do is make subraces of the ones you allow, granting them the powers you'd want. In the end this will just be reflavouring.
For example you can give dragon breath (fire) to dwarves creating Fire Dwarves, dwarves who live in a volcano.
Or better: drunk dwarves that have so much alcohol in their breath that they can shoot fire when they put a torch in front of them