Chat room that replaces comments on each post?

There isn’t a way to do this by default.. what you can do is edit your post template so you replace <?php comments_template(); ?> with <?php echo do_shortcode('[ng-chatroom id=""]'); ?> and figure out how to use a custom post meta to change the id per post.

As far as the 24-48 hour, you can wrap that echo do_shortcode in a if statement that checks the current date vs. post date to see if 48 hours have passed.

I will not be building this into the plugin, so just some suggestions for how to get it done with the plugin as it is now.