The feedback form is a good place to start. If you want to make a concerted effort to help improve our wiki, send an E-mail to Luis. We’re not adverse to letting people help maintain the documentation, but we don’t trust just leaving it wide open. 
For what it’s worth, we’ll soon be reworking all the documentation as we move the Codex Wiki functionality into ContentBox.
Thanks!
~Brad
ColdBox Platform Evangelist
Ortus Solutions, Corp
E-mail: brad@coldbox.org
ColdBox Platform: http://www.coldbox.org
Blog: http://www.codersrevolution.com