Yes, you guys should definitely see if Carrara can do this. I personally wouldn't be without it for character animation, especially facial expressions. Think about it: some facial expressions in real life cause your skin to stretch, and some cause it to wrinkle more. If you could progressively blend different custom bump or displacement maps based on morphs, you have the ability to simulate real skin in animation much better. For example, when you pucker your lips, the cracks and bumps become much more pronounced, but when you smile, your lips get much smoother. Same thing when you scowl your brow. Some of these changes could be represented in the topology of the mesh itself, providing you have enough detail to allow for it in the morphs, but still, a bump map or displacement map isn't created to take these changes into account, unless you make several of them, and blend them as you morph. It just looks more realistic in close-ups.