I think it's a required function that you can manage nginx additional config (server, after, before) and maybe change the vhost config.
this would be very handy
Upvote on this, definitely a must, or at least nginx.conf file auto included in the NGINX directives. This way all a customer has to do is create/edit the blank nginx.conf in the main directory of their site.
You can change NGINX configuration in the manage tab, is that what you mean?