Wow I haven't been here for ages, work for MB really has got on top of me.
Right BushidoBoy I wrote this http://www.moviebattles.com/forums/showthread.php?t=20526 a while ago. It goes through merging your animation with the game. If you want to implement new animations (as in completely new, never before in JA) then you'll need a coder to help you as well.
Secondly JRHockney, single handed blocking anims:
http://img139.imageshack.us/my.php?image=shot0203ua0.png
http://img362.imageshack.us/my.php?image=shot0201fj6.png
http://img398.imageshack.us/my.php?image=shot0197jz5.png
http://img184.imageshack.us/my.php?image=shot0199yi8.png
http://img237.imageshack.us/my.php?image=shot0195hg7.png
I made a full set for MB that I can merge and give you full permission to use