Is there any way to indicate a "sitewide" block? I'm developing a theme that I would like to contribute to the marketplace and I want it to have a logo (at least for my site). But I don't want to make anyone who wants to use it edit the header.php in order to display the logo.

I'd prefer to be able to make that a block section where someone can display their logo (with an Image Block) or the name of the site (with a Content Block).

But if I do it that way, you would have to set that same content/image on every page you create. It would be great to have an "apply to all pages" checkbox when creating content.

Is there already functionality for that?