1. the excerpt of portfolio format post could be shown by the custom code(/functions/pagebuilder/portolio.php). add the code under line:
<p class="back-excerpt"><?php the_excerpt(); ?></p>
3. Do you talk about the related posts? there is the section, refer the demo (4 images above the comment) http://ximudesign.com/aside/2014/04/11/what-space-really-looks-like/
FW: the video can’t be shown with in portfolio post’s template (except using the page builder), we’ll consider to add it in the future.
5. there is not the feature for portfolio module