You allow any race to take a feat, but modify the feat so that is does what Sneak Attack already does? Generous of you to make the feat useless and still allow people to take it.
Sorry, should've clarified that my houserule dates back to before SA was errata'd to include shortbows. At the time, the player thought it was still worth it; now I think I'm going to offer a free retrain or upgrade the feat to include longbows.