Still hacking away over at LiveJourbal.net :/...
Still trying to figure out the "additional mail system configuration" needed get the following setup:
-> Auto support-ticket generation for email sent to abuse/support/webmaster@
-> Aliases for paid accounts (user@LJb.net forwarding).
And, the configuration required to get subdomains setup for paid accounts (user.ljb.net).
If anyone has any advice on any of these problems, please let me know! I really appreciate it.