Try searching for "update.script" by HOWTO on directadmin.com site.
You should be fine
However you will get some errors. Post them here, i'll let you know how to correct them.
Yes, i'm using DA , but before i install LiteSpeed i Used Apache & i installed Mod_Security by Update.Script , BUT now in php.ini i can't see Mod_security, so i think it needed FreshInstall & Compiled with LiteSpeed !
Note : i didn't found php.ini IN /usr/local/lsws/lsphp5/lib , so i was copy php.ini that located in /usr/local/lib/php.ini to /usr/local/lsws/lsphp5/lib !