In code snippets create a new snippet with this code to run on the front-end only. Naming and tags is up to you

add_action( 'wp_head', function () { ?>
<script>
jQuery(function($) {
setInterval(function($) {
jQuery("div.wpforo-recent-content.wpfr-topics").load(location.href+" div.wpforo-recent-content.wpfr-topics>*","");
}, 120000);
});
</script>
<?php
} );

The timing (120000) is in milliseconds, thus set for 2 minutes, adjust that number to suit your needs. 

If the function gets baked into wpForo core then you can disable/delete the snippet

I want that function extended to the Recent Posts

Yes 100% agree with this. It would be a good feature 

Not sure what shortcodes have to do with the request I posted?

Since an update or two ago the wpForo sidebar widgets do now have an option to set an autorefresh time in seconds. I want that function extended to the Recent Posts page natively (where about 90% of my members sit all day). I accomplished this with an easy snippet but users/admins get lost when talking about custom coding snippets so baked in code that can be set in the dashboard would be the way to go for these admins/users. 

It just takes what the website looks like on any phone browser, and puts it into an app. It doesn't change anything, just removes the browser software form the situation put everything is the same.....

This won't improve the situation much IMO. We need something that changes the layout of the forum on mobile a little. More like the way apps like tapa talk displays forums, that would work great! But that site you posted isn't what I am looking for, im sure many others would agree. 

There are several solutions for converting a WordPress site into a mobile app. This is why we have assigned a lower priority to developing the wpForo mobile app on our to-do list. Here is a good example os such a service, it create Mobile APP for your website for all Mobile OS's:

https://www.webtonative.com/