Skinwalker Teisatsu Vigilante; Natural Weapon Build

[Zatoxic]

Good day Paizo forums, this is my very first post ever!

A friend of mine is going to be running a Jade Empire style campaign and I've come up with a Fanglord Teisatsu Vigilante and was wondering if it was possible to even make natural attacks with the claws a possibility.

The Jist: While he's in vigilante form, he's a tiger man and in tiger mode you can select a feature for that current transformation. In this case I'd be selecting two claw attacks for 1d4 damage. Is there a good feat combination that can augment those into being just as good as a decent melee weapon?

[technarken]

Improved Natural Attack makes them 1d6, but requires BAB 4, Rending Claws gives you added damage when both hit, but requires BAB 6. Extra Feature will let you pick up either a bite attack or See In Darkness while shifted.

Just consider them simple weapons that can't be sundered or disarmed, and they aren't that bad.