Yeah, it would be awesome if I could replace the '-' with just an empty string. Does anyone have a good idea of how to implement? The line that currently sets the '-' as the NULL character in the logs is:

src/http/modules/ngx_http_log_module.c:675

I thought about just writing a patch for it, but I'm not sure if that would mess things up in the future. Even still, what's the best way of doing this?