To answer the question about last year:
Between people randomly coming on stage and trying to "battle" with the pieces, and people kept giving a Mokona piece different weapons, and after a while, they were getting huge and hard for her to handle, especially since she couldn't see part what was in front of her.
I will be talking about these things at the Improv Fighting panel, as well, Jaki will be making an appearance to help with the rules.