I noticed you added support for Page Builder by SiteOrigin to GeneratePress in 1.2.9.4, are you planning to carry this support through to the Sections addon?
That “display: block” messes with other buttons like Jetpack’s “Contact Form”. I know it’s not at all your fault but you might want to be more specific than span, up to you in any case.
I’m afraid not – sections duplicates the editor for each section. Integrating the two would require us to duplicate the Page Builder functionality as well, which I’m pretty sure isn’t doable (too many things going on in Page Builder).