Adding Code Intelligence to the Komodo IDE is a matter of adding a specific XML-File to the IDE. Here is the link to the CIX-Files that do the trick:
http://community.activestate.com/files/gtk._gtk.cix_.gzExtract the files to a directory. Add the two under Edit/Preferences/CodeIntelligence "Add an API Catalog...".
Viola. You have code completion.