Really? There are several heroes that show jiggle bone behaviour, Witch Doctor's staff and Juggernaut's fur cape. It's definitely not keyframe animation.
No actually it is possible to do cloth effects on any hero, whether or not they have a cloth based item by default. Point in case: [ame="http://www.youtube.com/watch?v=a0YIYQROe0k"][DOTA2] Phantom Lancer Feathered Naginata Soft Body Physics Test - YouTube[/ame] That being said I still don't think it's a good idea to…