I am a DIY kind of guy, so I would suggest you create your own pivot system and animating software. If you know your trig, it is not all that hard to make software that performs the transformations based on numbers gathered from an array. Then create a program to let you design these animations and export them to a text or bmp file that will then be read by your game later. I really like working with stuff like this and would be glad to help you develop this system. Note that I have not done a whole lot on the tgc forums because I am in college, but I will try to stay up-to-date with this.
uh...Yah...