Imagine 'instance' application as 'browser windows' and 'thread' as 'browser tab'.
In this situation, nginx only permit 1 instance but many thread. What happen when using nginx for Kloxo?. It's big trouble when execute 'service nginx restart' (usually when add/remove/update domain).
Different with others (apache and etcetera). Others tend to many instance with 1 thread for every instance.
In Kloxo-MR, hiawatha already create symlink as 'kloxo-hiawatha' and then panel using it. So, if hiawatha dan kloxo-hiawatha exist as instance, 'service hiawatha restart' will not destroy 'kloxo-hiawatha' instance.
Reasons for using hiawatha (change from lxlighttpd) are:
1. also small like nginx and lighttpd
2. faster like nginx
3. more secure because many features related to security (like ip-ban)
4. possible many instance (like apache and lighttpd)