I would like to point your attention on interesting stuff: "Havok Animation Tools".
These tools allow you to create custom behavior files for your model.
There are a few mods I have made by using "Havok Animation Tools":
- http://www.nexusmods.com/skyrim/mods/62612/?
- http://www.nexusmods.com/skyrim/mods/46958/?
Take a look on it, please, and try it out
Maybe someone will find it useful and worth for learning enough to make something else with its help.