People love making Tieflings with all arrays of skin color. What do the rules say about that? And should you listen? Let's scope our some infernal bloodlines.
Eberron's new Changeling is the first class that can start with an 18 ability score at level 1. Although this "power creep" doesn't mean the class is unbalanced, the answer to rebalancing the race within the existing design paradigm may lay within cut content.