Scrolling comment plugin?

That’s not a plugin. Looking at the source, the comments are in this div:

<div id="mydiv1-83" style="display:visible; overflow: scroll; height: 175px; background:#f5f5f5; width:800px">

To place comments on the home page (or any page displaying multiple posts), I imagine the theme does something like:

https://www.ads-software.com/support/topic/68826#post-362846

Closing, duplicate topic.
https://www.ads-software.com/support/topic/146433

In the future do not post multiple topics on the same issue.