I've tried building 3 different CKEditor bundles and including some plugins. In particular, I want the color text plugin. I have overwitten the ckeditor folder in the includes folder and replaced the 3 php files. The editor works fine and a couple of the new plugins show up (for instance Smileys) but I still do not see the color plugin. The last time I tried downloading the full CK package with like 50 plugins and I still only see a couple of new ones. Is this something with the couch implementation, ckeditor or something I'm doing wrong?
Please refer to KK's response in the following thread: http://www.couchcms.com/forum/viewtopic.php?f=2&t=8683
Hope this helps.