Comment plus to include comments.php (Very Imp)

Hi, recently i tried using this plugin. If we don't install any other plugin related to facebook, this works great. However their is one very important thing i want to take in front of you, whenever we get logged in using any social network, suppose using twitter, the text box which appears is what you defined in your plugin. But i want that it should include the comments.php contents, since we have done many tweaks in it, like placing a check box for subscribe to comments & newsletter and more custom field which you can see in screenshot.

So my query is here, how i can include comments.php, so that changing tab above does not making any change below. If their are few changes required in code, please let me know asap, as i am already going late building this project.

Thanks & Regards