UPDATE:
What i meant to say is, Direct Admin should integrate Nginx and Lighttpd into direct admin, so users won't have to seperately download&install Nginx and Lighttpd.
For example:
1)user installs Direct admin
2)user logs into direct admin
3)user clicks on "web server" button
4)user Clicks on "Nginx" button
5)Direct admin is now using Nginx. Everything is installed and configured. Done.
Same for lighttpd.