It would be interesting to add in some extra obligation if a player chooses to use his claws, something the PC the has to try to live with.
That would make sense.
Based upon the illustrations and pictures I have seen, I don't really think that the claws of a Wookiee are anywhere as large and pronounced as those of a Trandoshan. I don't think they should give a full bonus, perhaps just a single bonus die on a brawl roll.