This plugin's philosophy is in line with what I'm trying to do in AnimationPoser. The next version of AnimationPoser will be quite complete in a self-contained sense and the next step is going to be external format imports. A BVH import to AnimationPoser would be quite awesome.
Advantages:
-Being able to translate/rotate the animations entirely BEFORE chaining them (this way they can be put together nicely)
-Adding transitory states between the animations with minimal effort
-Adding fully customizable random markov chain style transitions between the animations
-Syncing the animations in multiple characters without trigger hell
-Browse multiple animations, each one made of chaining smaller animations
-Anchor animations to any atom or control
I don't currently have knowledge about BVH. I'll study it and other formats to come up with import routines. There are two people contributing code right now to AnimationPoser. If you are interested in putting this together let me know.