dobee
Smash Apprentice
I don't exactly know how this works but you could possibly prevent sweetspots with this... I also don't know if there is a way to bring Nana back off of the edge but its still great for ice climbers.
http://www.youtube.com/watch?v=1xv6HNATOnc
http://www.youtube.com/watch?v=1xv6HNATOnc