Adding extra params to the OOTB Create Forum Port widget?

I'm doing some research for a customization request, and was wondering if it is possible to add additional fields to the Create Forum Post widget.

I can add a new form field without any issue, but the widget submits the form with JS code, and it doesn't pass my new field to the server.

In the code I see this...

jQuery(function(j){
    j.telligent.evolution.widgets.createEditPost.register({
        forumId: $forum.Id,
        applicationId: '$forum.ApplicationId',
        replyId: #if($threadOrReply && $threadOrReplyType == 'reply') $threadOrReply.Id#else -1#end,
        threadId: #if($threadOrReply && $threadOrReplyType == 'thread') $threadOrReply.Id#else -1#end,
        ...etc...
    });
});

My expectation is that this JS function handles grabbing all of the form data and submits it to the server, which makes sense.

So what my question is, is this mechanism extensible?  Are there arguments that I can pass to that function that will allow me to pass additional form field values to the server?

Thanks.