The interface is terribly lacking there, impossible to define proxy or anything really.

Nginx is one of those things where you need access to a full raw config.
From what I see you could do your domain overrides in /etc/nginx/vhost_includes/yourdomain
But this block in the nginx config handled by enhance is problematic
location / {
try_files $uri $uri/ =404;
}
Because in nginx you can't redefine a block. And the / block is most of the time the one you need to set a proxy. Can we get an option to remove that block and maybe a textarea to edit the vhost_include nginx config directly from this interface?