I doubt that this really does anything. Presumably, "one party" means "one person who is a party"; there's no means by which a single person can be multiple parties.
On a related note, years ago, it was ruled that "I act on behalf of myself to do X" means exactly the same thing as "I do X." Back then, there was no mechanism in the rules for one person to act on behalf of another. Instead, if a person A said "I permit person B to act on my behalf", and then person B sent a message saying "Person A does X", then the way that this was treated is that Person A was considered to be the author and the sender of that particular sentence, with Person B merely relaying the message to the forum. —Warrigal, who is emself
