i just did it in my extract Wit. I did a # which people said was too much.
it adds a creamy transition to the brew, which i appreciated. it does make it cloudy though. quite cloudy in fact. but that's acceptable to me for a Wit.
so basically, if the style calls for a cloudy hazy beer like a hef or wit, then it's perfect for steeping. otherwise you're going to have to find a way to clear that haze if it bothers you- possibly a malt addition with good enzymes, maybe an amber extract? you'll probably need something with enough enzymes to break down the proteins.
i'm no expert there. someone else will have to add to this.