@Jonathan

Thanks again for your inputs. This thread helped me learn few more things. :-)

Apart from that, I think, an application like web-based control-panel - built for Nginx specially, will anyway need take care of all this. Technically, if a script can write to a file and have new config updated automatically, it will have to handle security issue as well.

--
Rahul Bansal
EasyEngine - https://github.com/rtCamp/easyengine