Thanks for asking about this. We’re not that far from it.
In the latest version, we’ve added a Full Nimble template in beta version, with global header and footer. ( see this documentation to change the current page template : https://docs.presscustomizr.com/article/339-changing-the-page-template )
This beta template implements a new type of drop zone with a global scope. For the moment, you’ll need to pick the template for each page to be able to display the global sections created for your footer or header.
In the coming version, you’ll be able to create a custom header and footer with Nimble, and assign it site wide to all your pages, or only for some pages.
I hope this will cover your needs. In any case, your feedback will be greatly appreciated.