Etherpad can be easily extended with plugins, our plugin framework allows for simple 2 click installation, if you haven’t had time to check it out yet then now is a great time as 2013 was a bumper year for Etherpad plugins. Here are some plugins that might tempt you into getting started.
Check out ep_author_neat, a plugin that allows you to have the author information on the left hand side of the page where the line numbers are. Cool huh! :) Install it by hitting up your plugins page!