The goal is to selectively configure a single page of a multi-page document to:
- landscape (hyperlink to similar, yet a subset of this question) and
- paper size A3.
The hope is that the link is dated and that the community has found solutions to enable implementation of the line-items. If both are not possible for a single page, it would still be a 'win' if either was possible.
If this is not possible, I would encourage readers to send a feature request to Google and up vote the question to signal interest in the feature (maybe Google will take notice).