My suggestion is that if that is the most common related entity type that a user wants to see, there should be an option to have the "tab" for that associated list view appear to the left of "Related" by default.

Currently, if a user wants to see the associated view for a related record type on a form, one must click on "Related", scan down the list of entities to find the record type, and click it. Even if the most common one is at the top, this takes two clicks rather than one.

Note: I have simulated this with JavaScript that uses OpenRelatedGrid (referencing a hidden grid on the page) and then a 250ms delayed call to SetFocus back to the Summary (default) tab. In my case, this causes "Cases" to appear to the left of "Related" whenever I open an Order. This saves a few seconds each time a user wants to open the most common associated list.