I do not believe there are any plugins specifically catered to cPanel, however there are a few plugins which will allow you to add an iFrame to your admin pages. I have not used any of these, and agree with the other commenter (Chip) who mentioned that it may pose a security risk.
With that said, check out plugins like this: http://wordpress.org/extend/plugins/iframe-admin-pages/
search for similar: http://wordpress.org/extend/plugins/search.php?q=admin+iframe