Well its about time someone brought this to the fore front.
Luckily with the help of the notables in the community. ASK, Corto, RazorAce, etc. I'm Pretty much done with a JKA animatable Skeleton.
I'll be needing hosting for the xsi. And if You can do player models you can do this, Don't be shy now.
The how-to is exactly the same as JK2. Its the skeleton thats different.
Here's my test anim. Sorry I have no-where to host a clip but its a screeny.
I know its simple but it was just a quick test to make sure it didn't deform. I'll get to the complicated stuff here shortly.