MarketPress Global Categories + MultiSite


Q1. I'm trying to achieve a uniform tree of categories any seller can use to add products. Sellers can not create their own categories, they can only use the ones provided. I used the following post to take care of this:

However, updating the blog template adds new categories only for future sites, and not the ones already created. How can I get all sites to receive new categories once they are created and/or updated automatically?

Q2. Is there a way to load many categories at once? Like the Google product taxonomy list

The latest on it seems to be this post, but I could use more info on it:

Thank you,