It's unfortunately not possible right now, but we know people want it, so we're working on it. Probably have to tuck it into our advanced mode feature as it's not something we'll ever be able to solve with the point and click UI.
No. You can extract any content you want from the page (incl. text, images, links) just not meta elements or invisible ones (e.g. <title> or anything else that usually shows up in <head> for that matter)