While searching for solutions for my Wordpress/Firefox keyboard shortcut issue, I stumbled upon a terrific tutorial to customize the Quicktag menu bar. I have always wanted to add tags like <p> and <h3> to the menu, but couldn’t find the answer at Wordpress.org.
This tutorial even discusses the option for adding a Quicktag button for < to insert a < for easy code insertion into your posts.
http://www.tamba2.org.uk/wordpress/quicktags/
I will have to make time to read the other tutorials on this site. Looks like a real treasure.