I’m also interested on this. I would like to have the same footer across all page templates or at least be able to include it manually with some code. If only I new about this earlier, I cannot imagine a site without page footer. I can understand that I can use the landing page builder but it’s not always the case. The default page template should have an option to include the landing footer, if not all oft them.
I can use the template override feature via child template and alter the default page template.