re: it would be nice to modify the number or records listed, in the back-office (>50)
Yes, this is already possible. Here is the link to the documentation on how to change the item per page on the Connections : Manage admin page.
re: and in the front-office as well (>20).
Since you are using Slim Plus, you can change this setting using the page_limit shortcode option. Add
page_limit=30 to the existing
[connections] shortcode on your directory page to change the number. It’ll look something like this after you add it.
[connections page_limit=30]. I do not recommend settings to to too high of a number.
Hope this helps!