Would it be possible to sort the members' list with the latest to register being on top?
Please follow Robert's answer in here: https://wpforo.com/community/how-to-and-troubleshooting-2/how-to-sort-members-list-by-newest-to-oldest-order/#post-13476
However, the wpForo allows you to customize the fils. In this case, you should customize the members.php file.
Please follow this instruction to customize the wpForo files:
You just sent me on a wild goose chase. You could've easily said there's no way to do that.