If you have access to Dragon Mag, there's a feat in 355 called Beast Strike. It allows you to add your claw damage on top of your unarmed strike damage. It's a bit scarce on exactly how that happens, but the easiest way to do it is just add the dice damage and that's it. For example, if your US damage is 1d4 and your claw damage is 1d6, your unarmed strikes would now deal 1d4 + 1d6 damage, and then add strength and such.
Note that the way unarmed strikes and natural weapons interact is you get your full unarmed attack routine as normal, then you can do all your natural attacks but they're treated as secondary attacks (so they're -5 on attack rolls and only benefit from 1/2 your strength.)
Since Savage Species is allowed, there's the Necklace of Natural Weapons which you can enchant just like a weapon and have it apply to your claws, bite, etc.
For the interaction between Bear Warrior and Feral, note the line in Feral saying "If the base creature already has a claw attack, the feral creature uses the better base damage." It's pretty likely you'll be getting Feral's 1d8 for medium or 2d6 for large. Improved Natural Attack will use those as bases, so a medium Feral creature would do 2d6 claw damage and a large would do 3d6. To be honest it's not all that much extra damage until you get to the really big size increases.
You may want to look at the variant rules in Masters of the Wild page 18. Basically it says a raging barbarian gets a +4 morale bonus on Intimidate because entering a screaming blood frenzy tends to be, well, intimidating. There's also the variant where Intimidate is based on Strength instead of Charisma.
Solo included the Lion Spirit Totem from Complete Champion because it lets you trade the +10 foot speed bonus for being able to make a full attack at the end of a charge. That ACF does not mechanically conflict with the Wolf Totem presented in Unearthed Arcana. Your DM might think differently, but there's the option to call it the Mountain Lion Totem or something.
Unless this is a character you've already started on and can't change? If so, post it! We can't give proper advice without complete information.