It would be great to be able to preview a bvh animation on your actual avatar rather than in the upload window with a default shape. With mesh bodies changing the true shape of an avatar and not really being able to zoom in to look at the preview for small details like fingers and facial expressions can make it really easy to upload an errored animation. As firestorm currently allows for the bvh to be shown on the avatar itself, it'd be a nice feature to see added. If .anim files could be previewed as well even better!