I remember this subject (the rendering in-progress animation) came-up back when Martin was a daily fixture here on the forum(aka 'the good ole days...) When asked if the animation could optionally be removed or replaced with a users OWN animation, his reply went along the lines of: 'Yes, program your own 3D software and you can put whatever you want up there!"
I would think, with the developers SDK and an experienced programmer, a utility/plug-in could be written that overwrites the installed animation. A lot of work for little gain.
SPEAKING OF THIS tho, it might be good to have an animation contest where the winner(s) get their own little loop included in a later release of A:M... would be up to Steffen, as he is the one who would do the work of switching it out. It would be cool to see one of Paul Forwood's works included as a tribute to a great A:M user who recently passed-on.