-12db Gain on Export?

I know it's critical to watch levels throughout the entire mix! I do use Auto Gain in settings (not main VU meter), but for those occasions were levels might get away from get away from you a little during a mix could we have an option to reduce gain more on export? I chose -12db simply for ample headroom, and it's double the currently available -6db.

I did see a post about fine-tuning limiter on export. My request is more about a simple extra -db reduction.