Tieflings, eladrin, and dragonborn all got shoehorned in. Some of them fit better than others is all.
On another note, how might people feel about reskinning dragonmarks? (Within reason) More specifically, one of my LEB PCs had the 'Identify' type Mark of Finding, and is strongly not melee oriented- the 4e mechanics of MArk of Detection are actually much closer and more appropriate to the character. Would it be possibly acceptable to take the Mark of Detection feat, but say that it is, in 'flavor/background' terms, a House Tharashk mark? Or would this be an individual proposal case?