multipost-mu hack – publish just to child blog

It’s any way to modify the plugin in order to publish the post just on the other website (child post) without publishing it on the main blog? I mean to select just another blog to publish the article.
I want to send some of the posts received on one blog to another blog that has a more apropiate theme for that particular article.
Is this possible using this plugin and if it is can you please give me some instructions how to modify the plugin for that?
Thank you!