I asked a question on the MozillaZine Thunderbird forums that I thought would have an answer. Simply, I want the ability to whitelist multiple address books in the Junk Mail Controls Window. This would allow me to separate my personal e-mail contacts from my mailing list e-mail addresses, while both are whitelisted so they won’t get caught by the junk mail filter.
Update: Oops, looks like I duped a bug. Bug 187771 is the one that deals with whitelisting multiple address books.