This won't change the current situation. You could make a new animation without this, but you could only base it on the existing skeletons.

If you wanted to make a new shooting animation, you can. As far as firing in a volley, the current archers do just that.

What the new files were injtended ( had they actually worked ) was to allow you to run new ani mations outside of the pack files, and to use completely new skeletons. This would have given you far greater control over the process, and allowed you to do things that just can't be done now.