A new editor has been added to ModelConverterX, the animation editor. At this moment the functionality of the editor is still limited, you can use it to remove animations from the object. You can select at which keyframe you want to fix the geometry and then that becomes the static state of the object. The pictures below show how this can work for the default Baron.
For this simple functionality I would not have to make a special editor of course. But there are other animation related features on the wishlist, so these will be added to the animation editor later on as well.