Would be awsome if we could use some addon as addon content. As example I will use Tabs addon. I would love to have option to use some addon to load inside one tab. Righ now, I can only use text/HTML content for tab content.
Popup module - would be great if I could set some of addon as popup content.
Well, I don't know how hard is to implement this feature, but this could bring SP Pagebuilder to a whole new level.