The facility for adding comments using the DISQUS feature also allows you to add extra HTML coding to each post if it's relevant to the process of the comment.

For instance I have installed the DIGG Submit and Vote button via this method. I have also added the pingback facility by placing the relevant code into the DISQUS Settings of the blog. The post is in this blog Installing the Pingback module into DISQUS enabled Yola blogs


Now there is a facility for adding CSS to the comments section of the DISQUS commentaries.

I don't know if there is any absolute limit to the number of code segments that can be added but I wouldn't think that there will be many to possibly add either.