Google News category and genres

Hello,

First, how can i switch the ‘keywords’ in the news feed to tags instead of categories.

Second is i think you can better use a post meta for genres to select. I see on Google that are only 6 values allowed. https://support.google.com/news/publisher/bin/answer.py?hl=en&answer=93992
If no one selected, can you set the default to ‘Blog’.

Third is that i have not seen in the google docs (https://support.google.com/webmasters/bin/answer.py?hl=en&answer=74288) that changefreq, priority, lastmod must given.

Or can you load the feed templates form the theme folder. if not exists load the form plugin folder. That can i change it so, how i need them.

https://www.ads-software.com/extend/plugins/xml-sitemap-feed/