Ah, you want Bugzilla! :)
(Why go for a proprietary solution when a free one will work just as
well! And even if LiveJournal Support *is* free, we already use Bugzilla
and know how to set it up and use it...)
LiveJournal Support is free software.
Bugzilla is notoriously unusable for non-technical users. And it's not
designed for support requests, anyway.
Timwi