Implement RDF metadata
+ RDF is designed to be read and understood by computers
+ RDF is a part of the W3C's Semantic Web Activity
+ RDF is a W3C Recommendation

Social networking sites such as Facebook rely on the Meta Description for feed posts. It would be helpful of these fields could be filled out automatically so authors don't have to copy and paste a snippet of an article.

To increase search engine visibility, place the standarized HTML5 microdata in article and contact views.

Incorporate a couple of the formats described here: http://en.wikipedia.org/wiki/Microformat
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=146897

This will enrich Google search results.

For example in articles I am using images with lightbox. I want lightbox to be enabled on specific menu items or even the whole com_content component! (I am doing it now with custom module but if it could be a built-in way this will save page-load time, less kilobytes, HTTP requests )

Change the generated by Joomla tag to an OPTIONAL reference to a humans.txt file. This txt document could be autopopulated with credits to Joomla, 3rd party extensions, and web designer. Can be edited to show or hide any entry.

bla bla bla