Or, we could just ask the DirectAdmin staff to build the functionality into the new custombuild script. I really have to give my vote to LightTPD. I've seen some really great things. This article is another example of why this should be a change worth considering:
http://www.vmunix.com/mark/blog/archives/2006/01/02/fastcgi-scgi-and-apache-background-and-future
Apache + modules = poor reliablity. The memory consumption of httpd is just bad. I had a client with a dedicated server who was running millions of page views a day. His (cluster) of about 3 servers were all running out of memory trying to process mod_PHP + Apache requests. So, I moved him to *one* server, with LightTPD and a CGI version of PHP, and his server had like 80% of its memory available, with faster responses.
It's the wave of the future, guys. Surf it!
Forget Apache, and even Lighttpd (since honestly, that is never going to be compatible with DirectAdmin, and it doesn't even support .htaccess or RewriteRules in the same fashion as Apache).
www.litespeedtech.com is FULLY compatible with DirectAdmin. We run it across our fleet. We love it.